Cita APA (7a ed.)

Kanfer, F. H., & Goldstein, A. P. (1979). Helping people change: A textbook of methods. Pergamon.

Cita Chicago Style (17a ed.)

Kanfer, Frederick H., y Arnold P. Goldstein. Helping People Change: A Textbook of Methods. New York [etc.]: Pergamon, 1979.

Cita MLA (9a ed.)

Kanfer, Frederick H., y Arnold P. Goldstein. Helping People Change: A Textbook of Methods. Pergamon, 1979.