APA (7th ed.) Citation

Ephross, P. H., & Vassil, T. V. (1988). Groups that work: Structure and process. Columbia University Press.

Chicago Style (17th ed.) Citation

Ephross, Paul H., and Thomas V. Vassil. Groups That Work: Structure and Process. New York: Columbia University Press, 1988.

MLA (9th ed.) Citation

Ephross, Paul H., and Thomas V. Vassil. Groups That Work: Structure and Process. Columbia University Press, 1988.