APA stil citiranja
El'sgol'c, L. E. (1977). Differential equations and the calculus of variations: Differential equations and the calculus of variations. Moscow: Mir.
Chicago stil citiranjaEl'sgol'c, L. E. Differential equations and the calculus of variations: Differential equations and the calculus of variations. Moscow: Mir, 1977.
MLA stil citiranjaEl'sgol'c, L. E. Differential equations and the calculus of variations: Differential equations and the calculus of variations. Moscow: Mir, 1977.
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