Cita APA (7a ed.)

Heckhausen, H., & Leppmann, P. K. (1991). Motivation and action. Springer.

Cita Chicago Style (17a ed.)

Heckhausen, Heinz, y Peter K. Leppmann. Motivation and Action. Berlin [etc.]: Springer, 1991.

Cita MLA (9a ed.)

Heckhausen, Heinz, y Peter K. Leppmann. Motivation and Action. Springer, 1991.