APA

Keats J., . (1952). The letters of John Keats. London: Oxford University press.

Chicago

Keats John, . 1952. The letters of John Keats. London: Oxford University press.

Harvard

Keats J., . (1952). The letters of John Keats. London: Oxford University press.

MLA

Keats John, . The letters of John Keats. London: Oxford University press. 1952.