8Scardamalia, M., & Bereiter, C. (in press). Knowledge Building. In Encyclopedia of Education, Second Edition. New York: Macmillan Reference
9De Grave, W. S., & Others (1996). The Problem Based Learning: Cognitive and Metacognitive Processes during Problem Analysis. Instructional Science, vol, 24, no. 5, Sep 1996, p321-341
10Kang, M. & Kwon, Y. (2001). A Conceptual Framework for a Webbased Knowledge Construction Support System. Educational Technology. Vo. 41, No. 4