1. Alvarez, M. C. and Risco, V. J. (1987a). Vee diagrams: helping students understand the structure of knowledge. Washington, DC.: Paper presented at meetings of the American Educational Research Association.
2. Alvarez, M. C. and Risco, V. J. (1987b). Concept maps and Vee diagrams: a visual representation of children's thinking. Washington, DC.: Paper presented at AERA meeting.
3. Ault, C. R.Jr. (1985). Concept mapping as a study strategy in earth science. Journal of College Science Teaching, 15 (Sept/Oct), 38?44.
4. Ault, C. R.Jr., Novak, J. D. and Gowin, D. B. (1984). Constructing Vee maps for clinical interviews on molecule concepts. Science Education, 68(4), 441?462.
5. Ausubel, D. P. (1963). The psychology of meaningful verbal learning. New York: Grune and Stratton.