Παραπομπή APA

Elsgolts, L. (1970). Differential equations and the calculus of variations. Mir.

Παραπομπή Chicago Style

Elsgolts, L. Differential Equations and the Calculus of Variations. Moscow: Mir, 1970.

Παραπομπή MLA

Elsgolts, L. Differential Equations and the Calculus of Variations. Mir, 1970.