APA (7th ed.) Citation

Keegan, J. (2001). An illustrated history of the First World War. A.A. Knopf.

Chicago Style (17th ed.) Citation

Keegan, John. An Illustrated History of the First World War. New York: A.A. Knopf, 2001.

MLA (9th ed.) Citation

Keegan, John. An Illustrated History of the First World War. A.A. Knopf, 2001.