APA (7th ed.) Citation

Lanczos, C. (1986). The variational principles of mechanics (4th ed.). Dover Publications.

Chicago Style (17th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. 4th ed. New York: Dover Publications, 1986.

MLA (9th ed.) Citation

Lanczos, Cornelius. The Variational Principles of Mechanics. 4th ed. Dover Publications, 1986.