APA (7th ed.) Citation

Courant, R., Robbins, H., & Stewart, I. (1996). What is mathematics?: An elementary approach to ideas and methods (Second edition.). Oxford University Press.

Chicago Style (17th ed.) Citation

Courant, Richard, Herbert Robbins, and Ian Stewart. What Is Mathematics?: An Elementary Approach to Ideas and Methods. Second edition. New York: Oxford University Press, 1996.

MLA (9th ed.) Citation

Courant, Richard, et al. What Is Mathematics?: An Elementary Approach to Ideas and Methods. Second edition. Oxford University Press, 1996.