APA (7th ed.) Citation

Carathéodory, C. Calculus of variations and partial differential equations of the first order. Holden-Day.

Chicago Style (17th ed.) Citation

Carathéodory, Constantin. Calculus of Variations and Partial Differential Equations of the First Order. San Francisco, Calif: Holden-Day.

MLA (9th ed.) Citation

Carathéodory, Constantin. Calculus of Variations and Partial Differential Equations of the First Order. Holden-Day.

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