APA (7th ed.) Citation
Fox, C. (1950). An introduction to the calculus of variations. University press.
Chicago Style (17th ed.) Citation
Fox, Charles. An Introduction to the Calculus of Variations. Oxford: University press, 1950.
MLA (9th ed.) Citation
Fox, Charles. An Introduction to the Calculus of Variations. University press, 1950.
Warning: These citations may not always be 100% accurate.