Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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