Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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