APA (7th ed.) Citation

Putman, R. J., & Wratten, S. D. (1984). Principles of ecology. Croom Helm.

Chicago Style (17th ed.) Citation

Putman, Rory J., and Stephen D. Wratten. Principles of Ecology. London: Croom Helm, 1984.

MLA (9th ed.) Citation

Putman, Rory J., and Stephen D. Wratten. Principles of Ecology. Croom Helm, 1984.