APA (7th ed.) Citation

Ferguson. (2006). The war of the world: Twentieth-century conflict and the descent of the West. Penguin Books.

Chicago Style (17th ed.) Citation

Ferguson. The War of the World: Twentieth-century Conflict and the Descent of the West. London: Penguin Books, 2006.

MLA (8th ed.) Citation

Ferguson. The War of the World: Twentieth-century Conflict and the Descent of the West. Penguin Books, 2006.