APA (7th ed.) Citation

Lanczos, C. (1949). The variational principles of mechanics. Toronto : University of Toronto Pr.

Chicago Style (17th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. Toronto : University of Toronto Pr, 1949.

MLA (9th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. Toronto : University of Toronto Pr, 1949.

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