APA (7th ed.) Citation

Wellek, R., & Warren, A. (1970). Theory of literature (3rd [revised] ed.). Penguin.

Chicago Style (17th ed.) Citation

Wellek, Rene, and Austin Warren. Theory of Literature. 3rd [revised] ed. Harmondsworth: Penguin, 1970.

MLA (9th ed.) Citation

Wellek, Rene, and Austin Warren. Theory of Literature. 3rd [revised] ed. Penguin, 1970.