Newton, I., & Huygens, C. (1952). Mathematical principles of natural philosophy ; Optics. Encyclopaedia Britannica.
Chicago Style (17th ed.) CitationNewton, Isaac, and Christian Huygens. Mathematical Principles of Natural Philosophy ; Optics. Chicago: Encyclopaedia Britannica, 1952.
MLA (9th ed.) CitationNewton, Isaac, and Christian Huygens. Mathematical Principles of Natural Philosophy ; Optics. Encyclopaedia Britannica, 1952.