Kaufman, R. A. (1976). Identifying and solving problems: A system approach. University Associates.
Citazione stile Chigago Style (17a edizione)Kaufman, Roger A. Identifying and Solving Problems: A System Approach. La Jolla, Calif.: University Associates, 1976.
Citatione MLA (8a ed.)Kaufman, Roger A. Identifying and Solving Problems: A System Approach. University Associates, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.