Cita APA (7th ed.)

Sigelman, C. K., & Rider, E. A. (2009). Life-span human development (6th ed.). Wadsworth Cengage Learning.

Cita Chicago (17th ed.)

Sigelman, Carol K., i Elizabeth A. Rider. Life-span Human Development. 6th ed. Belmont, Calif: Wadsworth Cengage Learning, 2009.

Cita MLA (9th ed.)

Sigelman, Carol K., i Elizabeth A. Rider. Life-span Human Development. 6th ed. Wadsworth Cengage Learning, 2009.