APA (7th ed.) Citation

Ricklefs, R. E. (1990). Ecology (3. ed.). Freeman and Company.

Chicago Style (17th ed.) Citation

Ricklefs, Robert E. Ecology. 3. ed. New York: Freeman and Company, 1990.

MLA (9th ed.) Citation

Ricklefs, Robert E. Ecology. 3. ed. Freeman and Company, 1990.