1. Allport, G. A. (1935). Attitudes. In C. Murchison (Ed.), Handbook of social psychology (pp. 1–55). Worcester: Clark University Press.
2. Allport, G. A. (1937). Personality: A psychological interpretation. New York: Holt.
3. Blau, P. (1990). Structural constraints and opportunities: Merton’s contribution to general theory. In J. Clark, C. Modgil, & S. Modgil (Eds.), Robert K. Merton: Consensus and controversy (pp. 141–155). London: Falmer Press.
4. Blumer, H. (1969). Symbolic interaction. Englewood Cliffs: Prentice Hall.
5. Blumer, H. (1971). Social problems as collective behavior. Social Problems, 18, 3 (Winter), 298–306.