APA (7th ed.) Citation

Horne, J. (2010). A companion to World War I. Wiley-Blackwell.

Chicago Style (17th ed.) Citation

Horne, John. A Companion to World War I. Malden, MA: Wiley-Blackwell, 2010.

MLA (8th ed.) Citation

Horne, John. A Companion to World War I. Wiley-Blackwell, 2010.