Alcon, E. (2002). Relationship between teacher-led versus learners’ interaction and the development of pragmatics in the EFL classroom. International Journal of Educational Research, 37, 359-377.
                                                                                                                Ansalone, G. (2000). Keeping on track: A reassessment of tracking in the schools. Race, Gender and Class, 7(3), 1-25.
                                                                                                                Baleghizadeh, S., TimchehMemar, H., & TimchehMemar, A. (2010). The effect of symmetrical versus asymmetrical scaffolding on English reading comprehension of EFL learners. Studies in Literature and Language Journal, 1(7), 104-111.
                                                                                                                Baradaran, A., & Sarfarazi, B. (2011). The impact of scaffolding on the Iranian EFL learners’ English academic writing. Australian Journal of Basic and Applied Sciences, 5(12), 2265-2273.
                                                                                                                Bardovi-Harlig, K., & Dörnyei, Z. (1998). Do language learners recognize pragmatic violations? Pragmatic vs. grammatical awareness in instructed L2 learning. TESOL Quarterly, 32, 233-259.
                                                                                                                Bardovi-Harlig, K., & Griffin, R. (2005). L2 pragmatic awareness: Evidence from the ESL classroom. System, 33, 401-415.
                                                                                                                Birjandi, P., & Rezaei, S. (2010). Developing a multiple-choice discourse completion test of interlanguage pragmatics for Iranian EFL learners. ILI Language Teaching Journal, 6(1), 43-58.
                                                                                                                Brown, P., & Levinson, S. (1987). Politeness: Some universals in language usage. Cambridge: Cambridge University Press.
                                                                                                                Donato, R. (1994). Collective scaffolding in second language learning. In J.P. Lantolf & G. Appel, (Eds.), Vygotskian approaches to second language research (pp.33-56). Norwood, NJ: Ablex.
                                                                                                                Edstrom, A. (2015). Triads in the L2 classroom: Interaction patterns and engagement during a collaborative task. System, 52, 26-37.
                                                                                                                     Ellis, R. (2008). The study of second language acquisition. Oxford: Oxford University press.
                                                                                                                Gass, S. M. (1988). Integrating research areas: A framework for second language studies. Applied Linguistics, 9, 198-217.
                                                                                                                Hawkins, B. (2015). Using sociocultural theory to examine the context(s) of language learning and teaching. Working papers in TESOL and applied linguistics. Retrieved November 23, 2015, from http://tesolal.columbia.edu/article/using-sociocultural-theory/
                                                                                                                Jernigan, J. E. (2007). Instruction and developing second language pragmatic competence. Unpublished doctoral dissertation, The Florida State University. Retrieved September 14, 2014, from http://diginole.lib.fsu.edu/cgi/viewcontent.cgi?article=2565&context=etd. 
                                                                                                                Karimi, L., & Jalilvand, M. (2014). The effect of peer and teacher scaffolding on the reading comprehension of EFL learners in asymmetrical and symmetrical groups. The Journal of Teaching Language Skills (JTLS), 5(4), 1-17.
                                                                                                                Kasper, G., & Rose, K. (2002). Pragmatic development in a second language. Mahwah, NJ: Blackwell Publishing, Inc.
                                                                                                                Kim, Y. (2009). The effects of task complexity on learner-learner interaction. System, 37(2), 254-268.
                                                                                                                Kowal, M., & Swain, M. (1994). Using collaborative language production tasks to promote students’ language awareness. Language Awareness, 3, 73-93.
                                                                                                                Lantolf, J. (1994). Sociocultural theory and second language learning. Modern Language Journal, 78(4), 418-420.
                                                                                                                Lantolf, J. P., & Pavlenko, A. (1995). Sociocultural theory and second language acquisition. Annual Review of Applied linguistics, 15,108-124.
                                                                                                                Lantolf, J. P., & Poehner, M. E. (2014). Sociocultural theory and the pedagogical imperative in L2 education. New York: Routledge.
                                                                                                                Leeser, M.J. (2004). Learner proficiency and focus on form during collaborative dialogue. Language Teaching Research, 8, 55-82.
                                                                                                                Liu, J. (2006). Assessing EFL learners’ interlanguage pragmatic knowledge: 
Implications for testers and teachers. Reflections on English Language Teaching, 5(1), 1-22.
                                                                                                                Liu, J. (2007). Developing a pragmatics test for Chinese EFL learners. Language Testing, 24 (3), 391-415.
                                                                                                                LoCastro, V.  (2003). An introduction to pragmatics: Social action for language teachers. Ann Arbor, MI: University of Michigan Press.
                                                                                                                Maftoon, P., & Ghafoori, N. (2009). A comparative study of the effect of homogeneous and heterogeneous collaborative interaction on the development of EFL learners’ writing skill. The Journal of Applied Linguistics, 2(1), 127-158.
                                                                                                                                                                                                                                Murphy, Ph. (2007). Reading comprehension exercises online: The effect of feedback, proficiency and interaction. Language Learning and Technology, 11(3), 107-129.
                                                                                                                Ohta, A. S. (1995). Applying sociocultural theory to an analysis of learner discourse: Learner-learner collaborative interaction in the Zone of Proximal Development. Issues in Applied Linguistics, 6 (2), 93-121.
                                                                                                                Poorahmadi, M. (2009). The effect of employing scaffolding strategies and classroom tasks in teaching reading comprehension. Journal of Teaching English as a Foreign Language and Literature, 1(3), 87-106.
                                                                                                                Rahimi Domakani, M., & Felfelian, S. (2012). 
L2 learner interlanguage pragmatic development within ZPD activated proximal context. Paper presented at the
 first conference on interdisciplinary approaches to language learning and teaching, Mashhad, Iran.
                                                                                                                 Rahimi Domakani, M., Hashemian, M., & Mansoori, S. (2013). Pragmatic awareness of the request speech act in English as an additional language: Monolinguals or bilinguals? Journal of Research in Applied Linguistics, 4(1), 88-110.
                                                                                                                Razavi, A., & Tabatabaei, O. (2014). The effect of dynamic and non-dynamic assessment on acquisition of apology speech act among Iranian EFL learners. Journal of Academic and Applied Studies, 4(8), 1-20.
                                                                                                                Shehadeh, A. (2011). Effects and student perceptions of collaborative writing in L2. Journal of Second Language Writing, 20, 286-305.
                                                                                                                Storch, N. (2002). Patterns of interaction in ESL pair work. Language Learning, 52(1), 119-58.
                                                                                                                Song, L., & Liu, L. D. (2002). Apologies in Chinese and English: A research report. Intercultural Communication Studies, 11(3), 131-144.
                                                                                                                Storch, N., & Aldosari, A. (2013). Pairing learners in pair work activity. Language Teaching Research, 17, 31-48.
                                                                                                                Swain, M. (2000). The output hypothesis and beyond: Mediating acquisition through collaborative dialogue. In J.P. Lantolf (Ed.), Sociocultural theory and second language learning (pp. 97-114). Oxford:  Oxford University Press.
                                                                                                                Taguchi, N. (2011). Rater variation in the assessment of speech acts. Pragmatics, 21(3), 453-471.
                                                                                                                Tajeddin, Z., & Tayebipour, F. (2012). The effect of dynamic assessment on EFL learners’ acquisition of request and apology. The Journal of Teaching Language Skills, 4(2), 87-11.
                                                                                                                van Compernolle, R. , & Kinginger, C. (2013). Promoting metapragmatic development through assessment in the zone of proximal development.  Language Teaching Research, 17(3), 282-302.
                                                                                                                van Lier, L. (1996). Interaction in the language curriculum: Awareness, autonomy and authenticity. London: Longman.
                                                                                                                Webb, N. M., & Palincsar, A. S. (1996). Group processes in the classroom. In D. Berliner & R. Calfee (Eds.), Handbook of educational psychology (pp. 841–873). New York: Macmillan.
                                                                                                                Weir, C. J. (2005). Language testing and validation. New York: Palgrave Macmilian.
                                                                                                                Wu, M. Y. (2008).
 The impact of English proficiency on college learner-learners’ meaning negotiation in a Chinese EFL context. MA dissertation, 
Lanzhou University.Retrieved October 17, 2014, from 
http://mt.china-papers.com/2/?p=181471