APA (7th ed.) Citation

Pettet, E. C. (1957). On the poetry of Keats. University Press.

Chicago Style (17th ed.) Citation

Pettet, E. C. On the Poetry of Keats. Cambridge [Eng]: University Press, 1957.

MLA (9th ed.) Citation

Pettet, E. C. On the Poetry of Keats. University Press, 1957.