1Michael Yacci "Interactivity Demystified: A Structural Definition for Distance Educationand Intelligent CBT" http://www, it. tit. edu/~may/interactiv8.pdf
2Michael Moore. Three types of interaction [DB/OL].http://cdl.panam.edu/dayoung/professional/moorethreetypesofinteraction.htm.
3Hillman,D C ,Willis,D J ,& Gunawardena,C N Learner- interface interaction in distance education: An extension of contemporary models and strategies for practitioners[J]. The American Journal of Distance Education, 1994,(2):30-42.
4Wagner, E D In support of a functional definition of interaction[J].The American Journal of Distance Education, 1994,(2): 6-29.
