APA (7th ed.) Citation

Fox, C. (1954). An introduction to the calculus of variations. Oxford University Press.

Chicago Style (17th ed.) Citation

Fox, Charles. An Introduction to the Calculus of Variations. London: Oxford University Press, 1954.

MLA (9th ed.) Citation

Fox, Charles. An Introduction to the Calculus of Variations. Oxford University Press, 1954.

Warning: These citations may not always be 100% accurate.