These are the sites I used for research and reference :)
http://en.wikipedia.org/wiki/Georg_Bernhard_Riemann
http://en.wikipedia.org/wiki/János_Bolyai
http://en.wikipedia.org/wiki/Lobachevsky
http://en.wikipedia.org/wiki/Carl_Gauss
http://en.wikipedia.org/wiki/Euclid
http://en.wikipedia.org/wiki/Hyperbolic_geometry
http://en.wikipedia.org/wiki/Elliptic_geometry
http://en.wikipedia.org/wiki/Non-Euclidean_geometry
