Gaya APA

Goldstein, F, H, K, A, P. (1980). Helping people change: a texbook of methods ed . 2 (ed. 2). Hoboken, NJ: Pergamon Press.

Gaya MLA

Goldstein, Frederick, H., Kanfer;, Arnold, P.. "Helping people change: a texbook of methods ed . 2". ed. 2 Hoboken, NJ: Pergamon Press, 1980. Text.