6Paul, Richard.Critical Thinking: What Every Person Needs in a Rap idly Changing World[M].Sonoma, CA: Sonoma State University, 1990.
7Ricketts ,J.C.et al.2003.The Effect of Instructional Delivery Methods on the Critical Thinking Disposition of Distance Learners and Traditional On-campus Learners[J].Joumal of Southern Agricultural Education Research 1:59-71.
8Brown, M.1986.Preconditions for Encouraging Critical Thinking on the Campus[J].Intemational Journal of Social Education. 3 : 18-27.
9Boyer, E. 1989.Preparing the Professoriate of Tomorrow for Teaching: Enhancing the TA Experience. Keynote address delivered at the 2nd National Conference on the Training and Employment of Teaching Assistants. University of Washington, Seattle.
10Huitt, W. 1998.Critical thinking: An overview.Retrieved December, 1st, 2007 from. http://chiron.valdosta.edu/whuitt/col/cogsys/critthnk.html.