APA (7th ed.) Citation

Oster, G. F., & Wilson, E. O. (1978). Caste and ecology in the social insects. Monographs in population biology.

Chicago Style (17th ed.) Citation

Oster, George F., and Edward O. Wilson. "Caste and Ecology in the Social Insects." Monographs in Population Biology 1978.

MLA (8th ed.) Citation

Oster, George F., and Edward O. Wilson. "Caste and Ecology in the Social Insects." Monographs in Population Biology, 1978.