Cita APA (7th ed.)

Nicolson, H. (1939). Why Britain is at war. Penguin.

Cita Chicago (17th ed.)

Nicolson, Harold. Why Britain Is at War. Harmondsworth: Penguin, 1939.

Cita MLA (8th ed.)

Nicolson, Harold. Why Britain Is at War. Penguin, 1939.