References
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- Ginsburg, H., & Opper, S. (1979). Piaget's theory of intellectual development. Englewood Cliffs: Prentice-Hall.
- Orr, C. J. (1978). Communication, relativism, and student development. Communication Education, 27, 80–98.
- Perry, W. C., Jr. (1970). Forms of intellectual and ethical development in college students: A scheme. New York: Holt, Rinehart, & Winston.
- Smith, A. F. (1978). Lawrence Kohlberg's cognitive stage theory of the development of moral judgment. In Knefelkamp, et al. (Eds.), Applying new developmental findings. New Directions for Student Services, No. 4, San Francisco: Jossey-Bass.
- Widick, C. (1977). The Perry scheme: A foundation for developmental practice. The Counseling Psychologist, 6 (4), 39–42.