http://www.physics.usyd.edu.au/~cross/TRAJECTORIES/42.%20Ball%20Trajectories.pdf
http://www.robbinstabletennis.com/table%20tennis%20buying%20guide.htm

http://www.ittf.com/ittf_handbook/hb.asp?s_number=2

http://iml.jou.ufl.edu/projects/fall04/baksh/history.html

Knight, Randall Dewey. Physics for scientists and engineers: a strategic approach. San Francisco: Pearson/Addison Wesley, 2004. Print.