APA (7th ed.) Citation

Cross, R. (2012). History of war: 50 events you really need to know. Quercus.

Chicago Style (17th ed.) Citation

Cross, Robin. History of War: 50 Events You Really Need to Know. London: Quercus, 2012.

MLA (9th ed.) Citation

Cross, Robin. History of War: 50 Events You Really Need to Know. Quercus, 2012.