APA (7th ed.) Citation

Keats, J. (1951). Selected letters. Farrar, Straus and Young.

Chicago Style (17th ed.) Citation

Keats, John. Selected Letters. New York: Farrar, Straus and Young, 1951.

MLA (9th ed.) Citation

Keats, John. Selected Letters. Farrar, Straus and Young, 1951.