Kostiuk, N. (1979). Improving behavior. Silver Burdett.
Cita Chicago (17th ed.)Kostiuk, Nick. Improving Behavior. Silver Burdett, 1979.
Cita MLA (9th ed.)Kostiuk, Nick. Improving Behavior. Silver Burdett, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.