Berg, R. C., & Landreth, G. L. (1990). Group counseling: Concepts and procedures. Accelerated Development Inc.
Chicago (17e ed.) BronvermeldingBerg, Robert C., en Garry L. Landreth. Group Counseling: Concepts and Procedures. Muncie, India: Accelerated Development Inc, 1990.
MLA (9e ed.) BronvermeldingBerg, Robert C., en Garry L. Landreth. Group Counseling: Concepts and Procedures. Accelerated Development Inc, 1990.
Let op: Deze citaties zijn niet altijd 100% accuraat.