Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Newton, Isaac, y Christiaan Huygens. Mathematical Principles of Natural Philosophy: Optics. Chicago [etc.]: Encyclopaedia Britannica, 1952.

Cita MLA (9a ed.)

Newton, Isaac, y Christiaan Huygens. Mathematical Principles of Natural Philosophy: Optics. Encyclopaedia Britannica, 1952.