APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Pars, L. A. An Introduction to the Calculus of Variations. London, Melbourne: Heinemann, 1962.

MLA (8th ed.) Citation

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