APA (7th ed.) Citation

Lanczos, C. (1970). The variational principles of mechanics (4a. ed.). Dover.

Chicago Style (17th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. 4a. ed. Nueva York: Dover, 1970.

MLA (9th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. 4a. ed. Dover, 1970.