Cita APA

Robert C Beck. (1990). Motivation: Theories and principles. PHI.

Chicago Edition Citation

Robert C Beck. Motivation: Theories and Principles. New Jersey: PHI, 1990.

Cita MLA

Robert C Beck. Motivation: Theories and Principles. PHI, 1990.

Atenció: Aquestes cites poden no estar 100% correctes.