1. Alesandrini, K. (1984). Pictures and adult learning.Instructional Science, 13, 63–77.
2. Anderson, J. R. (1980).Cognitive psychology and its implications. San Francisco: W. H. Freeman.
3. Branson, R., & Grow, G. (1987). Instructional systems development. In R. Gagné (Ed.),Instructional technology: Foundations (pp. 397–428). Hillsdale, NJ: Lawrence Erlbaum.
4. Broadbent, D. E. (1971).Decision and stress. New York: Academic Press.
5. Caraballo, A. (1985).An experimental study to investigate the effects of computer animation on the understanding and retention of selected levels of learning outcomes. Unpublished doctoral dissertation, The Pennsylvania State University.