APA (7th ed.) Citation

Wells, H. G. (1937). A short history of the world. Penguin Books.

Chicago Style (17th ed.) Citation

Wells, H. G. A Short History of the World. Harmondsworth: Penguin Books, 1937.

MLA (9th ed.) Citation

Wells, H. G. A Short History of the World. Penguin Books, 1937.