APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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