Cita APA (7th ed.)

Courant, R., & Robbins, H. (1941). What is mathematics: An elementary approach to ideas and methods by Richard Courant and Herbert Robbins. Oxford University.

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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