3Spiro, R. J. & Jehng, J-C. Cognitive flexibility and hypertext: The ory and technology for the nonlinear and multidimensional traversal of complex subject matter [A]. D. Nix & R. J. Spiro. Cognition, ed ucation and multimedia: Exploring ideas in high technology [C].Hillsdale,NJ: Lawrence Erlbaum Associates, 1990.163-205.
4Spiro, R. J.,Feltovich, P. J.Jacobson, M. J & Coulson, R.L.. Cognifive Flexibility, Constructivism and Hypertext: Random Access In struction for Advanced Knowledge Acquisition in Ill-structured Do mains[A]. T. M. Duffy & D. H Jonassen. Constructivism and the Technology of Instruction: A Conversation. Hillsdale [C]. Hillsdale, NI: Lawrence Erlbaum Associates.1992.57-75.
