Cita APA (7th ed.)

Beck, R. C. (1990). Motivation: Theories and principles (3rd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Beck, Robert C. Motivation: Theories and Principles. 3rd ed. Englewood Cliffs, N.J: Prentice Hall, 1990.

Cita MLA (9th ed.)

Beck, Robert C. Motivation: Theories and Principles. 3rd ed. Prentice Hall, 1990.