(2009, abstract) ^ " Smithsonian Puts Mysterious Crystal Skull on Display " . http://www.foxnews.com/story/0,2933,378923,00.html . Retrieved 7-10-2008 .   ^ Various authors. "The Crystal Skulls" Skeptic magazine. Vol. 14, No. 2. 2008. Page 89. ^ Claudel, Paul. The Satin Slipper. Trans. John O'Connor and Paul Claudel. London: Sheed & Ward, 1931.