Kaufman, R. A. (1976). Identifying and solving problems: A system approach. University Associates.
Lua i Stíl Chicago (17ú heag.)Kaufman, Roger A. Identifying and Solving Problems: A System Approach. La Jolla, Calif.: University Associates, 1976.
Lua MLA (8ú heag.)Kaufman, Roger A. Identifying and Solving Problems: A System Approach. University Associates, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.