Portrait of Constantijn Huygens (1596-1687) and his Five Children | Mauritshuis
Christiaan Huygens (April 14, 1629 — July 8, 1695), Dutch Astronomer, horologist, mathematician, physicist | World Biographical Encyclopedia
Cosmotheoros: or, conjectures concerning the inhabitants of the planets. Translated from the Latin of Christian Huygens. A new edition, corrected.: Huygens, Christiaan: 9781170827185: Amazon.com: Books
ESA - Portrait of Christiaan Huygens (1629-1695)
Constantijn Huygens - Wikipedia
Eric Huygens Obituary - Sarasota, FL
Amazon.com: Huygens: The Man behind the Principle: 9780521850902: Andriesse, C. D., Miedema, Sally: Books