Cita APA (7a ed.)

Boyd, D., & Bee, H. L. (2009). Lifespan development (Fifth edition.). Pearson Education, Inc.

Cita Chicago Style (17a ed.)

Boyd, Denise, y Helen L. Bee. Lifespan Development. Fifth edition. Boston, MA: Pearson Education, Inc, 2009.

Cita MLA (9a ed.)

Boyd, Denise, y Helen L. Bee. Lifespan Development. Fifth edition. Pearson Education, Inc, 2009.