APA (7th ed.) Citation

Drude, P. The theory of optics. Dover Publications, Inc.

Chicago Style (17th ed.) Citation

Drude, Paul. The Theory of Optics. New York: Dover Publications, Inc.

MLA (8th ed.) Citation

Drude, Paul. The Theory of Optics. Dover Publications, Inc.

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