Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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