Cita APA (7a ed.)

Gruber, H. E., Darwin, C. R., Barrett, P. H., & Piaget, J. (1974). Darwin on man: A psychological study of scientific creativity. Wildwood House.

Cita Chicago Style (17a ed.)

Gruber, Howard E., Charles Robert Darwin, Paul Howard Barrett, y Jean Piaget. Darwin on Man: A Psychological Study of Scientific Creativity. London: Wildwood House, 1974.

Cita MLA (9a ed.)

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