Παραπομπή APA

Kelley, M. L., & Stokes, T. F. (1982). Contingency contracting with disadvantaged youths: Improving classroom performance.

Παραπομπή Chicago Style

Kelley, Mary Lou, και Trevor F. Stokes. Contingency Contracting With Disadvantaged Youths: Improving Classroom Performance. 1982.

Παραπομπή MLA

Kelley, Mary Lou, και Trevor F. Stokes. Contingency Contracting With Disadvantaged Youths: Improving Classroom Performance. 1982.

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