APA (7th ed.) Citation

Silverman, M., Ziefert, H., & Schumacher, C. (1989). Where babies come from: Stories to help parents answer preschoolers' questions about sex. Random House.

Chicago Style (17th ed.) Citation

Silverman, Martin, Harriet Ziefert, and Claire Schumacher. Where Babies Come from: Stories to Help Parents Answer Preschoolers' Questions About Sex. New York: Random House, 1989.

MLA (9th ed.) Citation

Silverman, Martin, et al. Where Babies Come from: Stories to Help Parents Answer Preschoolers' Questions About Sex. Random House, 1989.