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.
Atenció: Aquestes cites poden no estar 100% correctes.