Cita APA (7th ed.)

Eastman, N., & Hellman, L. M. (1961). Williams Obstetrics (12.ed.). Appleton-Century-Croffts.

Cita Chicago (17th ed.)

Eastman, Nicholson, i Louis M. Hellman. Williams Obstetrics. 12.ed. New York: Appleton-Century-Croffts, 1961.

Cita MLA (9th ed.)

Eastman, Nicholson, i Louis M. Hellman. Williams Obstetrics. 12.ed. Appleton-Century-Croffts, 1961.