APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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