APA (7th ed.) Citation

Schwartz, W., & Zalba, S. R. (1971). The practice of group work. Columbia University Press.

Chicago Style (17th ed.) Citation

Schwartz, William, and Serapio R. Zalba. The Practice of Group Work. New York: Columbia University Press, 1971.

MLA (9th ed.) Citation

Schwartz, William, and Serapio R. Zalba. The Practice of Group Work. Columbia University Press, 1971.