APA (7th ed.) Citation

Gruber, H. E., Darwin, C., & Barrett, P. H. (1974). Darwin on man: A psychological study of scientific creativity. E. P. Dutton.

Chicago Style (17th ed.) Citation

Gruber, Howard E., Charles Darwin, and Paul H. Barrett. Darwin on Man: A Psychological Study of Scientific Creativity. New York: E. P. Dutton, 1974.

MLA (9th ed.) Citation

Gruber, Howard E., et al. Darwin on Man: A Psychological Study of Scientific Creativity. E. P. Dutton, 1974.