1Shute, V. & Psotka, J. Intelligent Tutoring System: Past, Present, and Future[A]. D.Jonassen. Handbook of Research for Educational Communications and Teclmology[C].New York: Macmillan. 1996.570-600.
2Mymic Llc. Outstanding Research Issues in Intelligent Tutoring Systems [DB/OL]. http://whqlibdoc.who.int/hq/pre-wholis/ PUB_5.pdf.
3Reva Freedman. What is an Intelligent Tutoring System? [DB/ OL] .http://www.cs.niu.edu/-freedman/papers/link2000.pdf.