Cita APA

Singer, S., & Hilgard, H. R. (1978). The Biology of People. W. H. Freeman.

Chicago Edition Citation

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

Cita MLA

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