APA
Elsgolts L, Translated From the Russian by George Yankovsky, . (1977). Differential Equations and the Calculus of Variations. Moscow: MIR Publishers.
Chicago
Elsgolts L, Translated From the Russian by George Yankovsky, . 1977. Differential Equations and the Calculus of Variations. Moscow: MIR Publishers.
Harvard
Elsgolts L, Translated From the Russian by George Yankovsky, . (1977). Differential Equations and the Calculus of Variations. Moscow: MIR Publishers.
MLA
Elsgolts L, Translated From the Russian by George Yankovsky, . Differential Equations and the Calculus of Variations. Moscow: MIR Publishers. 1977.