Cita APA (7a ed.)

Ryan, R. M., & Deci, E. L. (2000). Intrinsic and extrinsic motivations: Classic definitions and new directions. [s.n.].

Cita Chicago Style (17a ed.)

Ryan, Richard M., y Edward L. Deci. Intrinsic and Extrinsic Motivations: Classic Definitions and New Directions. [S.l.]: [s.n.], 2000.

Cita MLA (9a ed.)

Ryan, Richard M., y Edward L. Deci. Intrinsic and Extrinsic Motivations: Classic Definitions and New Directions. [s.n.], 2000.