Cita APA (7th ed.)
Sawyer, W. W. (1943). Mathematician`s Delight (1a.ed.). Penguin books.
Cita Chicago (17th ed.)
Sawyer, W. W. Mathematician`s Delight. 1a.ed. Michigan: Penguin books, 1943.
Cita MLA (9th ed.)
Sawyer, W. W. Mathematician`s Delight. 1a.ed. Penguin books, 1943.
Atenció: Aquestes cites poden no estar 100% correctes.