Windows 7: The Unofficial Quick Reference    by Scott Douglas
Price: $2.99 USD. 2950 words. Published on October 20, 2009. .
You’ve heard about Windows 7—maybe you’ve even seen it in actual—but what exactly is it? How is it different from any other Windows operating system before it, and should you upgrade your computer to it? These questions and more are answered in On the Go Reference’s Windows 7: The Unofficial Quick Reference.

Windows 8 For Beginners    by John Monyjok Maluth
Price: $16.99 USD. 13850 words. Published by maluthabiel on May 7, 2013. .
Windows 8 is the most recent Operating System designed by the Microsoft Company after Windows 7. Windows 8 share many common features with Windows Vista and Windows 7, but this is not all you need to know. There are many different items and features added to Windows 8 than what you know on the previous versions of Windows.