APA (7th ed.) Citation

Sawyer, W. W. (1943). Mathematician's delight. Penguin Books Ltd.

Chicago Style (17th ed.) Citation

Sawyer, Walter W. Mathematician's Delight. England: Penguin Books Ltd, 1943.

MLA (9th ed.) Citation

Sawyer, Walter W. Mathematician's Delight. Penguin Books Ltd, 1943.