3Brown, H. D. 1994. Teaching by Principles: An Interactive Approach to Language Pedagogy. Prentice Hall Regents.
4Doughty, C. & P. Teresa, 1986. “Information gap” tasks: Do they facilitate second language acquisition? TESOL Quarterly. 20/2, 305-325.
5Grant, N. 1987. Making the Most of Your Textbook. USA: Longman Inc.
6Green, C. G., E. R. Christopher and J. Lam, 1997.“Developing discussing skills in the ESL classroom” ELT Journal. 51/2, 135-142.
7Johnson, K. E., 1995. Understanding Communication in Second Language Classrooms. Cambridge: CUP.
8Kohonen, V. 1992. “Experiential language learning: second language learning as cooperative learner education.” in D. Nunan (eds).cooperative Language Learning and Teaching.Cambridge CUP.14-39.
9Nunan, D. 1989. Designing Tasks for the Communicative Classroom. Cambridge: CUP.
10Nunan, D. 1992. Collabrative Language Learning and Teaching. Cambridge: CUP.