APA (7th ed.) Citation

Newton, I., & Huygens, C. (1996). Mathematical principles of natural philosophy: Optics (2nd, 6th print.). Encyclopædia Britannica.

Chicago Style (17th ed.) Citation

Newton, Isaac, and Christiaan Huygens. Mathematical Principles of Natural Philosophy: Optics. 2nd, 6th print. Chicago: Encyclopædia Britannica, 1996.

MLA (9th ed.) Citation

Newton, Isaac, and Christiaan Huygens. Mathematical Principles of Natural Philosophy: Optics. 2nd, 6th print. Encyclopædia Britannica, 1996.