Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Courant, Richard, i Herbert Robbins. What Is Mathematicsn: An Elementary Approach to Ideas and Methods. New York: Oxford University Press, 1941.

Cita MLA (9th ed.)

Courant, Richard, i Herbert Robbins. What Is Mathematicsn: An Elementary Approach to Ideas and Methods. Oxford University Press, 1941.