7[4]JONASSEN D,et al.Constructivism and Computer-Mediated Communication in Distance Education[J].The American Journal of Distance Education,1995,9(2).
8[6]JONASSEN D.Designing Constructivist Learning Environments[A].REIGELUTH C M.Instructional Design Theories and Models:A New Paradigm of Instructional Theory (Vol.II)[C].Mahwah,NJ:Lawrence Erlbaum Associates,1999.215-239.
9[7]SAVERY J,DUFFY T.Problem Based Learning:an Instructional Model and Its Constructivist Framework[A].WILSON B G.Designing Constructivist Learning Environments[C].Englewood Cliffs:Educational Technology Publications,1995.135-148.
