Cita APA (7th ed.)
Schwartz, W., & Zalba, S. R. (1971). The practice of group work.
Cita Chicago (17th ed.)
Schwartz, William, i Serapio R. Zalba. The Practice of Group Work. 1971.
Cita MLA (9th ed.)
Schwartz, William, i Serapio R. Zalba. The Practice of Group Work. 1971.
Atenció: Aquestes cites poden no estar 100% correctes.