APA (7th ed.) Citation

Singer, S., & Hilgard, H. R. (1978). The biology of people. W. H. Freeman.

Chicago Style (17th ed.) Citation

Singer, Sam, and Henry R. Hilgard. The Biology of People. San Francisco: W. H. Freeman, 1978.

MLA (9th ed.) Citation

Singer, Sam, and Henry R. Hilgard. The Biology of People. W. H. Freeman, 1978.