APA (7th ed.) Citation

Horne, J. (2012). A companion to World War I. Wiley-Blackwell.

Chicago Style (17th ed.) Citation

Horne, John. A Companion to World War I. Chichester Malden Oxford: Wiley-Blackwell, 2012.

MLA (9th ed.) Citation

Horne, John. A Companion to World War I. Wiley-Blackwell, 2012.