APA (7th ed.) Citation

Townsend, C. R., Begon, M., & Harper, J. L. (2003). Essentials of ecology (2nd ed.). Blackwell Pub..

Chicago Style (17th ed.) Citation

Townsend, Colin R., Michael Begon, and John L. Harper. Essentials of Ecology. 2nd ed. Malden, MA; Oxford, UK: Blackwell Pub., 2003.

MLA (9th ed.) Citation

Townsend, Colin R., et al. Essentials of Ecology. 2nd ed. Blackwell Pub., 2003.