Gulley, H. E. (1966). Discussion, conference, and group process. Holt, Rinehart and Winston.

Gulley, Halbert E. Discussion, Conference, and Group Process. New York: Holt, Rinehart and Winston, 1966.

Gulley, Halbert E. Discussion, Conference, and Group Process. Holt, Rinehart and Winston, 1966.