APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (9वां संस्करण) प्रशस्ति पत्र

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

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