APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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