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* [http://www.mcescher.com/ M.C. Escher - The Official Website]
: [http://www.mcescher.com/gallery/ M.C. Escher – Gallery]
: [http://www.mcescher.com/licensing/ All works by M.C. Escher are copyrighted]
* [https://commons.wikimedia.org/wiki/Category:Maurits_Cornelis_Escher Category:Maurits Cornelis Escher - Wikimedia Commons]
* [http://escherdroste.math.leidenuniv.nl/ Escher and the Droste effect] - [[Leiden University|Universiteit Leiden]] » [[Recursion]]
