APA (7th ed.) Citation

Knowles, M. S., & Knowles, H. (1959). Introduction to group dynamics. Association Press.

Chicago Style (17th ed.) Citation

Knowles, Malcolm S., and Hulda Knowles. Introduction to Group Dynamics. New York: Association Press, 1959.

MLA (9th ed.) Citation

Knowles, Malcolm S., and Hulda Knowles. Introduction to Group Dynamics. Association Press, 1959.