APA (7th ed.) Citation

Huygens, C. (1968). The celestial worlds discover'd / by C. Huygens. Cass.

Chicago Style (17th ed.) Citation

Huygens, Christiaan. The Celestial Worlds Discover'd / by C. Huygens. Cass, 1968.

MLA (9th ed.) Citation

Huygens, Christiaan. The Celestial Worlds Discover'd / by C. Huygens. Cass, 1968.

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