Bibliography for power of illusion

Bibliography:

Adelson, E. H. (2009). The squares marked A and B are the same shade of gray. Retrieved from

http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html

Britton, J. (2009). Jill Britton's Escher Gallery. Retrieved from

http://britton.disted.camosun.bc.ca/escher/jbescher.htm

Freaking News (2012). M. C. Escher's and Q*bert Monello Pics. Retrieved from

http://www.freakingnews.com/M-C-Escher-s-and-Q-bert-Monello-Pics-66705.asp

Spectacular Illusions (2010). Escher Chessboard. Retrieved from

http://spectacular-illusions.blogspot.co.nz/2010/04/escher-chessboard.html

Vurdlak (2006). Paraller world illusion. Retrieved from

http://www.moillusions.com/2006/03/parallel-world-illusion.html

Weird Optics (2011). Escher’s Waterfall Visual Optical Illusion. Retrieved from

http://www.weirdoptics.com/eschers-waterfall-illusion/