APA (7th ed.) Citation

Owen, D. F. (1980). What is ecology? (2nd ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Owen, Denis F. What Is Ecology? 2nd ed. Oxford: Oxford University Press, 1980.

MLA (9th ed.) Citation

Owen, Denis F. What Is Ecology? 2nd ed. Oxford University Press, 1980.