Kemp, C. G. (1970). Perspectives on the group process: A foundation for counseling with groups (2nd.ed.). Houghton Mifflin.

Kemp, C. Gratton. Perspectives on the Group Process: A Foundation for Counseling with Groups. 2nd.ed. New York: Houghton Mifflin, 1970.

Kemp, C. Gratton. Perspectives on the Group Process: A Foundation for Counseling with Groups. 2nd.ed. Houghton Mifflin, 1970.