APA (7th ed.) Citation

Courant, R., & Robbins, H. (1996). Mathematics?: An elementary approach to ideas and methods. Oxford University Press.

Chicago Style (17th ed.) Citation

Courant, Richard, and Herbert Robbins. Mathematics?: An Elementary Approach to Ideas and Methods. Oxford University Press, 1996.

MLA (8th ed.) Citation

Courant, Richard, and Herbert Robbins. Mathematics?: An Elementary Approach to Ideas and Methods. Oxford University Press, 1996.

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