APA (7th ed.) Citation

Keegan. (2005). The Second World War. Penguin Books.

Chicago Style (17th ed.) Citation

Keegan. The Second World War. New York: Penguin Books, 2005.

MLA (8th ed.) Citation

Keegan. The Second World War. Penguin Books, 2005.

Warning: These citations may not always be 100% accurate.