APA (7th ed.) Citation

Arnold, C., & Zallinger, J. (1981). Sex hormones: Why males and females are different. Morrow.

Chicago Style (17th ed.) Citation

Arnold, Caroline, and Jean Zallinger. Sex Hormones: Why Males and Females Are Different. New York: Morrow, 1981.

MLA (9th ed.) Citation

Arnold, Caroline, and Jean Zallinger. Sex Hormones: Why Males and Females Are Different. Morrow, 1981.