Projective geometry history
• http://www-groups.dcs.st-and.ac.uk/%7Ehistory/HistTopics/Art.html
• http://www.math.nus.edu.sg/aslaksen/projects/perspective/theory.htm

Perspective drawing
• http://mypage.iu.edu/~mathart/vpbook/

Non-Euclidean geometry history
• http://www-groups.dcs.st-and.ac.uk/%7Ehistory/HistTopics/Art.html
• http://www.math.nus.edu.sg/aslaksen/projects/perspective/theory.htm
• http://plato.stanford.edu/entries/geometry-19th/ p.1-3
• http://www.math.washington.edu/%7Eking/coursedir/m445w05/notes/non-euclidean.pdf
• http://www-groups.dcs.st-and.ac.uk/%7Ehistory/HistTopics/Non-Euclidean_geometry.html

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