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.
Precaución: Estas citas no son 100% exactas.