APA (7th ed.) Citation

Sheffield, M., & Bewley, S. (1973). Where do babies come from? Knopf.

Chicago Style (17th ed.) Citation

Sheffield, Margaret, and Sheila Bewley. Where Do Babies Come from? New York: Knopf, 1973.

MLA (9th ed.) Citation

Sheffield, Margaret, and Sheila Bewley. Where Do Babies Come from? Knopf, 1973.