APA (7th ed.) Citation

Newton, I., & Huygens, C. (1952). Mathematical principles of natural philosophy ; Optics. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Newton, Isaac, and Christian Huygens. Mathematical Principles of Natural Philosophy ; Optics. Chicago: Encyclopaedia Britannica, 1952.

MLA (9th ed.) Citation

Newton, Isaac, and Christian Huygens. Mathematical Principles of Natural Philosophy ; Optics. Encyclopaedia Britannica, 1952.

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