APA Style
L.Elsgolts, .
(1977).
Differential Equations And The Calculus Of Variatios
(
3)
.
Moscow:
Mir Puplisers.
MLA Style
L.Elsgolts, .
"Differential Equations And The Calculus Of Variatios".
3
Moscow:
Mir Puplisers,
1977.
Text.