Cita APA (7th ed.)

Petri, H. L. (1991). Motivation: Theory, research and applications (3rd ed.). Wadsworth.

Cita Chicago (17th ed.)

Petri, Herbert L. Motivation: Theory, Research and Applications. 3rd ed. Belmont, California: Wadsworth, 1991.

Cita MLA (9th ed.)

Petri, Herbert L. Motivation: Theory, Research and Applications. 3rd ed. Wadsworth, 1991.