5Knirk, F. G. Designing productive learning envirnments. [M], Englewood Cliffs, NJ: Educational Technology Publications. 1979.
6Gavriel Salomon,What Does The Design of Effective CSCL Require and How Do We Study Its Effects? Proceeding of the conference on Computer Supported Collaborative Learning. 1995.
7Good Ideas to Foment Educational Revolution:The Role of Systemic Change in Advancing Situated Learning Constructivsm and Feninist Pedagogy by Alison A Carr David H,Jonassen Mary Ellen Litzinger Rose M,Marra Educational Technology/January-February 1998
