Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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