Citação norma APA

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

Citação norma Chicago

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

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.