APA (7th ed.) Citation

Karush, W. (1942). Isoperimetric problems and index theorems in the calculus of variations.

Chicago Style (17th ed.) Citation

Karush, William. Isoperimetric Problems and Index Theorems in the Calculus of Variations. 1942.

MLA (8th ed.) Citation

Karush, William. Isoperimetric Problems and Index Theorems in the Calculus of Variations. 1942.

Warning: These citations may not always be 100% accurate.