1. Gartner Says Windows 7 Will Be Running on 42 Percent of PCs in Use Worldwide by the End of 2011 www.gartner.com/it/page.jsp?id=1762614
2. Operating Systems Desktop Share www.netmarketshare.com/
3. The ‘Year of the Linux Desktop’ Isn't Coming | ZDNet www.zdnet.com/blog/hardware/the-year-of-the-linux-desktop-isnt-coming/16022
4. The Story of Linux: Commemorating 20 Years of the Linux Operating System https://blogs.oracle.com/linux/entry/the_story_of_linux_commemorating