1. Anderson, M. (1999). The Teaching of Reading. London: Hollen Street Press Limited:1.
2. Barkley, E. , Cross, P., & Major, C. (2005). Collaborative learning techniques: A handbook for college faculty. San Francisco: Jossey Bass: 172-176.
3. Best, J. W., and Kahn, J. V. (2006). Research in education, 10th. New Delhi: PHI Learning Private Ltd.:289.
4. Booth, David. (1998). Guiding the Reading Process: Techniques and Strategies for Successful Instruction in K-8 Classroom. Ontario: Pembroke Publishers.: 10.
5. Brown, H. D. (2000). Principles of language learning and teaching (Vol. 4). New York: Longman.:12.