2Duffy, T. & D. Jonassen. Construetivism: New Implications for Instructional Technology [ J ]. Educational Technology,1991,(5) :7 - 12.
3Gao, Yihong. The " 1 + 1 > 2" Model of L2 learning [ D ].PekingUniversityDotorate Dissertation, 1991.
4Jacobson, M. & J. Leven. Network I.e.aming Environment and Hypertext : Constructing Personal and Shared Knowledge Spaces [ A ]. Proceedings of Tel-Fd93 [ C ]. Dallas, Texas:International Society for Technology in Education, 1993. 190- 197.
5Spiro R. Coulson R. & P. Feltovieh. Cognitive Flexibility Theory: Advanced Knowledge Acquisition in Structured Domains [ A ]. Proceedings of Tenth Annual Conference of the Cognitive Science Society[C]. Hillsdale, New Jersey: Lawrence Erbaum Associates, 1988. 375 - 383.
6Spiro, R. et al. Cognitive Flexibility, Construetivism, and Hypertext : Random Access II,-*truetion for Advanced Knowledge Acquisition in Ill-structured Domains[ A]. In Duffy T.& D. Jonassen ( eds. ) Constructivism and the Technology of Instruction : A Conversation [ C ].Hillsdale, New Jersey :Lawrence Erbaum Associates, 1991.57 - 75.
