8Sehnker, L. "Interlanguage" International Review of Applied Linguistics 10 (1972): 209-231. 被引量:1
9Vygotsky, L.S. Thought and Language. Cambridge,MA: The M.I.T Press, 1962. 被引量:1
10Shneiderman, B. "Education by engagement and Constructioru Can Distant Education be Better Than Face- to-Face." 1994. Scivw. Encyclopedia of Virtual Environmats. 10 Apr. 2003 < http://www. hitl. Washington. edu/seivw/EVE/distance.html >. 被引量:1