Courant, R., & Robbins, H. (1941). What is Mathematics?: An elementary approach to ideas and methods. Oxford University Press.
Цитирование в стиле Чикаго (17-е изд.)Courant, Richard, и Herbert Robbins. What Is Mathematics?: An Elementary Approach to Ideas and Methods. London: Oxford University Press, 1941.
Цитирование MLA (9-е изд.)Courant, Richard, и Herbert Robbins. What Is Mathematics?: An Elementary Approach to Ideas and Methods. Oxford University Press, 1941.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.