APA (7th ed.) Citation

Keats, J., & Arnold, W. T. (1907). The poetical works of John Keats. MacMillan.

Chicago Style (17th ed.) Citation

Keats, John, and William T. Arnold. The Poetical Works of John Keats. London: MacMillan, 1907.

MLA (9th ed.) Citation

Keats, John, and William T. Arnold. The Poetical Works of John Keats. MacMillan, 1907.