APA (7th ed.) Citation

Pars, L. A. (1962). An introduction to the calculus of variations. Wiley.

Chicago Style (17th ed.) Citation

Pars, L. A. An Introduction to the Calculus of Variations. New York: Wiley, 1962.

MLA (9th ed.) Citation

Pars, L. A. An Introduction to the Calculus of Variations. Wiley, 1962.

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