APA
Newton I., Huygens C., . (1952). Mathematical principles of natural philosophy. Chicago: Encyclopaedia Britannica.
Chicago
Newton Isaac, Huygens Christiaan, . 1952. Mathematical principles of natural philosophy. Chicago: Encyclopaedia Britannica.
Harvard
Newton I., Huygens C., . (1952). Mathematical principles of natural philosophy. Chicago: Encyclopaedia Britannica.
MLA
Newton Isaac, Huygens Christiaan, . Mathematical principles of natural philosophy. Chicago: Encyclopaedia Britannica. 1952.