APA (7th ed.) Citation

ELSGOLC, L. (1961). Calculus of variations. Pergamon Press.

Chicago Style (17th ed.) Citation

ELSGOLC, L.E. Calculus of Variations. Oxford: Pergamon Press, 1961.

MLA (9th ed.) Citation

ELSGOLC, L.E. Calculus of Variations. Pergamon Press, 1961.