APA (7th ed.) Citation

Wellek, R., & Warren, A. (1973). Theory of literature. Penguin Books.

Chicago Style (17th ed.) Citation

Wellek, Rene, and Austin Warren. Theory of Literature. [Harmondsworth, Middlesex]: Penguin Books, 1973.

MLA (9th ed.) Citation

Wellek, Rene, and Austin Warren. Theory of Literature. Penguin Books, 1973.