1. & (1986). Statistical methods for the social sciences (2nd ed.). San Francisco, CA: Dellen.
2. (1988). Attitudes, personality, and behavior. Chicago: Dorsey Press.
3. & (1980). Understanding attitudes and predicting social behavior. Englewood Cliffs, NJ: Prentice-Hall.
4. Normative and Attitudinal Control as Moderating Influences on Marijuana Use
5. & (1989). Educational research: An introduction. (5th ed.). New York: Longman.