Παραπομπή σε μορφή APA (7η εκδ.)

Courant, R., & Robbins, H. (1969). 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: Oxford University Press, 1969.

Παραπομπή σε μορφή MLA (8th εκδ.)

Courant, Richard, και Herbert Robbins. What Is Mathematics?: An Elementary Approach to Ideas and Methods. Oxford University Press, 1969.