APA (7th ed.) Citation

Aitken, J. (1946). English letters of the XIX century. Penguin.

Chicago Style (17th ed.) Citation

Aitken, James. English Letters of the XIX Century. Harmondsworth: Penguin, 1946.

MLA (8th ed.) Citation

Aitken, James. English Letters of the XIX Century. Penguin, 1946.