Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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