APA (7th ed.) Citation

Lanczos, C. (1970). The variational principles of mechanics (4th ed.). University of Toronto Press.

Chicago Style (17th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. 4th ed. Toronto: University of Toronto Press, 1970.

MLA (9th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. 4th ed. University of Toronto Press, 1970.

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