APA (7th ed.) Citation

Roberts, D. F., & Harrison, G. A. (1959). Natural selection in human populations. Symposium Publications Division, Pergamon Press.

Chicago Style (17th ed.) Citation

Roberts, D. F., and G. A. Harrison. Natural Selection in Human Populations. New York: Symposium Publications Division, Pergamon Press, 1959.

MLA (9th ed.) Citation

Roberts, D. F., and G. A. Harrison. Natural Selection in Human Populations. Symposium Publications Division, Pergamon Press, 1959.