Cita APA (7a ed.)

Turner, J. S., & Helms, D. B. (1979). Life Span Development: Instructoŕs Manual. W. B. Saunders Co.

Cita Chicago Style (17a ed.)

Turner, Jeffry S., y Donald B. Helms. Life Span Development: Instructoŕs Manual. Philadelphia: W. B. Saunders Co, 1979.

Cita MLA (9a ed.)

Turner, Jeffry S., y Donald B. Helms. Life Span Development: Instructoŕs Manual. W. B. Saunders Co, 1979.