Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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