APA (7th ed.) Citation

Purves, A. C. (1991). The Idea of difficulty in literature. State University of New York Press.

Chicago Style (17th ed.) Citation

Purves, Alan C. The Idea of Difficulty in Literature. Albany: State University of New York Press, 1991.

MLA (9th ed.) Citation

Purves, Alan C. The Idea of Difficulty in Literature. State University of New York Press, 1991.