Platforms, Gartner Group, http://www.gartner.com/technology/reprints.do? id=1-‐1QLGACN&ct=140210&st=sb • Wikipedia, various articles, https://en.wikipedia.org/wiki/Main_Page • The various vendor Web sites • The Grammar of Graphics. Leland Wilkinson. 2nd ed., 2005. Springer. http://www.springer.com/statistics/computational+statistics/book/ 978-‐0-‐387-‐24544-‐7