APA (7th ed.) Citation

Keats, J., Ward, A., Gentleman, D., Dreyfus, J., & Crutchley, B. The poems of John Keats.

Chicago Style (17th ed.) Citation

Keats, John, Aileen Ward, David Gentleman, John Dreyfus, and Brooke Crutchley. The Poems of John Keats.

MLA (9th ed.) Citation

Keats, John, et al. The Poems of John Keats.