Citazione Stile APA (7a Edizione)

Berg, R. C., & Landreth, G. L. (1990). Group counseling: Concepts and procedures (2nd ed.). Accelerated Development Inc.

Citazione stile Chigago Style (17a edizione)

Berg, Robert C., e Garry L. Landreth. Group Counseling: Concepts and Procedures. 2nd ed. Muncie, Ind: Accelerated Development Inc, 1990.

Citatione MLA (9a ed.)

Berg, Robert C., e Garry L. Landreth. Group Counseling: Concepts and Procedures. 2nd ed. Accelerated Development Inc, 1990.