APA (7th ed.) Citation

Sawyer, W. W. (1966). Introducing mathematics 4: A path to modern mathematics. Penguin Books.

Chicago Style (17th ed.) Citation

Sawyer, W. W. Introducing Mathematics 4: A Path to Modern Mathematics. England: Penguin Books, 1966.

MLA (9th ed.) Citation

Sawyer, W. W. Introducing Mathematics 4: A Path to Modern Mathematics. Penguin Books, 1966.

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