APA (7e ed.) Bronvermelding

Kaufman, R. A. (1976). Identifying and solving problems: A system approach. University Associates.

Chicago (17e ed.) Bronvermelding

Kaufman, Roger A. Identifying and Solving Problems: A System Approach. La Jolla, Calif.: University Associates, 1976.

MLA (8e ed.) Bronvermelding

Kaufman, Roger A. Identifying and Solving Problems: A System Approach. University Associates, 1976.