Gaya APA

Heckel, R, V., H.C., I, S. (1976). Group psychotherapy a behavioral approach . Columbia: Columbia: Univ. of South Carolina; 1976.

Gaya MLA

Heckel, Robert, V.., H.C., I., Salzberg,. "Group psychotherapy a behavioral approach". Columbia: Columbia: Univ. of South Carolina; 1976, 1976. Text.