Gaya APA

Swanson, C, P., Ohlsen, M, M. (NULL). Group counseling . New: New York: Holt, Rinehart and Winston; 1977.

Gaya MLA

Swanson, Carl, P.., Ohlsen, Merle, M. "Group counseling". New: New York: Holt, Rinehart and Winston; 1977, NULL. Text.