APA (7e ed.) Bronvermelding

Johnson, J. A. (1963). Group therapy: A practical approach. Blakiston Division, McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Johnson, James A. Group Therapy: A Practical Approach. New York: Blakiston Division, McGraw-Hill, 1963.

MLA (9e ed.) Bronvermelding

Johnson, James A. Group Therapy: A Practical Approach. Blakiston Division, McGraw-Hill, 1963.