Cita APA (7a ed.)

Courant, R., & Robbins, H. (1941). What is mathematics? Oxford University Press.

Cita Chicago Style (17a ed.)

Courant, Richard, y Herbert Robbins. What Is Mathematics? London: Oxford University Press, 1941.

Cita MLA (8a ed.)

Courant, Richard, y Herbert Robbins. What Is Mathematics? Oxford University Press, 1941.