Citazione Stile APA (7a Edizione)

Sawyer, W. W. (1964). Vision in elementary mathematics. Penguin Books.

Citazione stile Chigago Style (17a edizione)

Sawyer, W. W. Vision in Elementary Mathematics. Harmondsworth, Eng.: Penguin Books, 1964.

Citatione MLA (9a ed.)

Sawyer, W. W. Vision in Elementary Mathematics. Penguin Books, 1964.