APA (7th ed.) Citation

Sawyer, W. W. (1955). Prelude to mathematics / by W.W. Sawyer. Penguin.

Chicago Style (17th ed.) Citation

Sawyer, W. W. Prelude to Mathematics / by W.W. Sawyer. Penguin, 1955.

MLA (9th ed.) Citation

Sawyer, W. W. Prelude to Mathematics / by W.W. Sawyer. Penguin, 1955.

Warning: These citations may not always be 100% accurate.