Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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