6Knowles M. Self-directed learning: A guide for learners and teachers. Toronto: The Adult Education Company,1975. 18.
7Zimmerman BJ. Becoming a self-regulated learner: An overview. Theory into Practice, 2002, 41(2): 64-72.
8Jonassen DH. The Trouble with Learning Environments. Educational Technology, 1993, 33 (1): 35-37.
9Sheerin S. An exploration of the relationship between self-access and independent learning. In Benson P, Voller P,eds. Autonomy and Independence in Language Learning. London: Longman,1997. 54-65.
