APA (7th ed.) Citation

Courant, R., & Robbins, H. (1941). What is mathematics: An elementary approach to ideas and methods by Richard Courant and Herbert Robbins. Oxford University.

Chicago Style (17th ed.) Citation

Courant, Richard, and Herbert Robbins. What Is Mathematics: An Elementary Approach to Ideas and Methods by Richard Courant and Herbert Robbins. Londres: Oxford University, 1941.

MLA (9th ed.) Citation

Courant, Richard, and Herbert Robbins. What Is Mathematics: An Elementary Approach to Ideas and Methods by Richard Courant and Herbert Robbins. Oxford University, 1941.