Mac OS X killer tips od Kelby, Scott

Sams teach yourself Red Hat Linux 9 in 24 hours od Hsiao, Aron

Guide to Linux networking and security od Wells, Nicholas

Just enough Unix od Andersen, Paul K.

Red hat linux administration a beginner's guide od Turner, Michael

Aries Server+ certified computer technician

A+ technician's on-the-job guide to Windows XP od Simmons, Curt 1968-

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The business and economics of linux and open source od Fink, Martin

Developing WMI solutions a guide to Windows management instrumentation od Tunstall, Craig

Linux administration a beginner’s guide od Graham, Steven