APA (7th ed.) Citation

Keats, J. (1880). Poetical works of John Keats. George Routledge.

Chicago Style (17th ed.) Citation

Keats, John. Poetical Works of John Keats. New York: George Routledge, 1880.

MLA (8th ed.) Citation

Keats, John. Poetical Works of John Keats. George Routledge, 1880.