APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Pars, L. A. An Introduction to the Calculus of Variations. Mineola, N.Y: Dover Publications, 1962.

MLA (9th ed.) Citation

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

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