APA (7th ed.) Citation

American Mathematical Society & Ėlʹsgolʹt︠s︡, L. Ė. (1962). Differential geometry and calculus of variations. American Mathematical Society.

Chicago Style (17th ed.) Citation

American Mathematical Society and L. Ė Ėlʹsgolʹt︠s︡. Differential Geometry and Calculus of Variations. Providence (R.I.): American Mathematical Society, 1962.

MLA (8th ed.) Citation

American Mathematical Society and L. Ė Ėlʹsgolʹt︠s︡. Differential Geometry and Calculus of Variations. American Mathematical Society, 1962.