Eckert, J. W. (2003). Linux+ guide to linux certification [ada CD]. Thomson Learning.
Lua i Stíl Chicago (17ú heag.)Eckert, Jason W. Linux+ Guide to Linux Certification [ada CD]. Thomson Learning, 2003.
Lua MLA (8ú heag.)Eckert, Jason W. Linux+ Guide to Linux Certification [ada CD]. Thomson Learning, 2003.
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