APA (7th ed.) Citation

Wellek, R., & Warren, A. (1963). Theory of literature (3.ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Wellek, René, and Austin Warren. Theory of Literature. 3.ed. Harmondsworth: Penguin Books, 1963.

MLA (9th ed.) Citation

Wellek, René, and Austin Warren. Theory of Literature. 3.ed. Penguin Books, 1963.