Gaya APA
Heckel, R, V., Salzberg, H, C. (1976).
Group psychotherapy a behavioral approach .
Columbia:
Univesity of South Carolina Press.
Gaya MLA
Heckel, Robert, V.., Salzberg, H., C..
"Group psychotherapy a behavioral approach".
Columbia:
Univesity of South Carolina Press,
1976.
Text.