1. Ajzen, I., and Fishbein, M. (1980).Understanding Attitudes and Predicting Behavior, Prentice Hall, Englewood Cliffs, N.J.
2. Ausubel, D. P. (1954).Theory and Problems of Adolescent Development, Grune & Stratton, New York.
3. Becker, M. H., Haefner, D. P., Kasl, S. V., Kirscht, J. P., Maiman, L. A., and Rosenstock, I. M. (1977). Selected psychosocial models and correlates of individual health-related behaviors.Med. Care 15 (Suppl): 27?46.
4. Doob, L. (1971).The Patterning of Time, Yale University Press, New Haven, Conn.
5. Drake, R. A. (1984). Lateral asymmetry of personal optimism.J. Res. Personal. 18: 497?507.