APA (7th ed.) Citation

Jourdain, P. E. B. (1913). The principle of least action. Open Court.

Chicago Style (17th ed.) Citation

Jourdain, Philip E. B. The Principle of Least Action. Chicago: Open Court, 1913.

MLA (8th ed.) Citation

Jourdain, Philip E. B. The Principle of Least Action. Open Court, 1913.