Duits
Becker spielwaren. online-shop für puzzles und poster mit motiven von m.c. escher.
http://www.mcescher.de/
M.C. Escher
M.C. Escher
http://www.mcescher.com/
Mathematical art of M.C. Escher
Article on the mathematical art of m.c. escher, with emphasis on inspiring the student to see mathematics with fresh eyes.
http://www.mathacademy.com/pr/minitext/escher/index.asp
World of Escher
The web site to explore the great m.c. escher artworks. each image has commentary and a zoom mode. online tesselation contests, reading material and secure shopping area for the 170 escher related products, make this the best web site for m. c. escher surfing.
http://www.worldofescher.com/