APA (7e ed.) Bronvermelding

Courant, R., & Robbins, H. E. j. a. (1941). What is mathematicsn An elementary approach to ideas and methods. Oxford university press.

Chicago (17e ed.) Bronvermelding

Courant, Rchard, en Herbert Ellis joint author Robbins. What Is Mathematicsn An Elementary Approach to Ideas and Methods. London, New York: Oxford university press, 1941.

MLA (9e ed.) Bronvermelding

Courant, Rchard, en Herbert Ellis joint author Robbins. What Is Mathematicsn An Elementary Approach to Ideas and Methods. Oxford university press, 1941.