1. Turtle geometry: The computer as a medium for exploring mathematics;Abelson,1981
2. Learning by “cheating”: Students' inventive ways of using a Boxer motion microworld;Adams;Journal of Mathematical Behavior,1991
3. Cyberspace: First steps,1991
4. The social construction of reality: A treatise in the sociology of knowledge;Berger,1966
5. Knowledge and social imagery;Bloor,1976