Citação norma APA

Courant, R., & Robbins, H. E. j. a. (1941). What is mathematicsn An elementary approach to ideas and methods. Oxford university press.

Citação norma Chicago

Courant, Rchard, and Herbert Ellis joint author Robbins. What Is Mathematicsn An Elementary Approach to Ideas and Methods. London, New York: Oxford university press, 1941.

Citação norma MLA

Courant, Rchard, and Herbert Ellis joint author Robbins. What Is Mathematicsn An Elementary Approach to Ideas and Methods. Oxford university press, 1941.

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