Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

Courant, Richard, και Herbert Robbins. What Is Mathematics: An Elementary Approach to Ideas and Methods. London ; New York: Oxford university press, 1941.

Παραπομπή σε μορφή MLA (9th εκδ.)

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