1Holec H. Autonomy in Foreign Language Learning [ M ]. Oxford: Pergamon, 1981.
2Robert O' Dowd. Evaluating the outcomes of online intercultural exchange[ J ]. ELT Journal,2007,61 (2).
3Wenger E. Communities of Practice : Learning [ M ]. Meaning and Identity Cambridge University Press, 1998.
4Chickering A W, Gamson Z F. Applying the Seven Principles for Good Practice in Undergraduate Education [ J ]. Jossey - Bass, New Directions for Teaching and Learning, 1987 (47) :63 - 69.
