APA (7th ed.) Citation

El'sgol'ts, L. E. (1961). Calculus of variations. Pergamon.

Chicago Style (17th ed.) Citation

El'sgol'ts, L. E. Calculus of Variations. Pergamon, 1961.

MLA (9th ed.) Citation

El'sgol'ts, L. E. Calculus of Variations. Pergamon, 1961.

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