Cita APA (7th ed.)

Turner, J. S., & Helms, D. B. (1983). Lifespan development (2nd. ed.). Holt, Rinehart and Winston.

Cita Chicago (17th ed.)

Turner, Jeffrey S., i Donald B. Helms. Lifespan Development. 2nd. ed. New York: Holt, Rinehart and Winston, 1983.

Cita MLA (9th ed.)

Turner, Jeffrey S., i Donald B. Helms. Lifespan Development. 2nd. ed. Holt, Rinehart and Winston, 1983.