Cita APA (7th ed.)

Boyd, D. R., & Bee, H. L. (2009). Lifespan development (Fifth edition.). Pearson/A and B.

Cita Chicago (17th ed.)

Boyd, Denise Roberts, i Helen L. Bee. Lifespan Development. Fifth edition. Boston, [Massachusetts]: Pearson/A and B, 2009.

Cita MLA (9th ed.)

Boyd, Denise Roberts, i Helen L. Bee. Lifespan Development. Fifth edition. Pearson/A and B, 2009.