APA (7th ed.) Citation

Varley, G. C., Gradwell, G. R., & Hassell, M. P. (1973). Insect population ecology: An analytical approach. Blackwell.

Chicago Style (17th ed.) Citation

Varley, G. C., G. R. Gradwell, and M. P. Hassell. Insect Population Ecology: An Analytical Approach. Oxford: Blackwell, 1973.

MLA (9th ed.) Citation

Varley, G. C., et al. Insect Population Ecology: An Analytical Approach. Blackwell, 1973.