Cita APA (7th ed.)

Beck, R. C. (1978). Motivation: Theories and principles. Prentice-Hall.

Cita Chicago (17th ed.)

Beck, Robert C. Motivation: Theories and Principles. Englewood Cliffs, N.J: Prentice-Hall, 1978.

Cita MLA (9th ed.)

Beck, Robert C. Motivation: Theories and Principles. Prentice-Hall, 1978.