1. Ausubel, D. P., J. D. Novak, and H. Hanesian.1978. Educational psychology: A cognitive view, 2nd ed. New York: Holt, Rinehart, & Winston.
2. Bandura, A.1986. Social foundation of thought and action: A social cognitive theory. Englewood Cliffs, NJ: Prentice Hall.
3. Bandura, A.1995. Exercise of personal and collective efficacy in changing societies. In Self-efficacy in changing societies, ed. A. Bandura, 1-45. Cambridge: Cambridge University Press.
4. Chen, Y., and F. Willits.1998. A path analysis of the concepts in Moore's theory of transactional distance in a videoconferencing learning environment. Journal of Distance Education 13 (2). Available online at http://cade.athabascau.ca/vol13.2/chen.html