APA (7th ed.) Citation

Garnett, D., & Gardner, J. (1940). The Battle of Britain. Penguin Books.

Chicago Style (17th ed.) Citation

Garnett, David, and James Gardner. The Battle of Britain. Harmondsworth ; New York: Penguin Books, 1940.

MLA (9th ed.) Citation

Garnett, David, and James Gardner. The Battle of Britain. Penguin Books, 1940.