Fitzgerald, T. J. (1974). Contingency contracting: Work projects with male juvenile delinquent probationers. Univ. Microfilms.
Chicago-Zitierstil (17. Ausg.)Fitzgerald, Thomas Joe. Contingency Contracting: Work Projects with Male Juvenile Delinquent Probationers. Ann Arbor, Mich: Univ. Microfilms, 1974.
MLA-Zitierstil (9. Ausg.)Fitzgerald, Thomas Joe. Contingency Contracting: Work Projects with Male Juvenile Delinquent Probationers. Univ. Microfilms, 1974.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.