Quellen

• The Celestia Motherlode. Solar System: Earth. Online (21.1.2007):
  http://www.celestiamotherlode.net/catalog/earth.php
• Pinecoast Software. SwirlX3D, VRML and X3D Tutorials. Online (21.1.2007)
  http://www.swirlx3d.com/tutorials.htm