Campbell, P. (2003). Security+ guide to network security fundamentals [ada CD]Paul Campbell, Ben Calvert, Steven Boswell. Thomson Learning.
Lua i Stíl Chicago (17ú heag.)Campbell, Paul. Security+ Guide to Network Security Fundamentals [ada CD]Paul Campbell, Ben Calvert, Steven Boswell. Thomson Learning, 2003.
Lua MLA (8ú heag.)Campbell, Paul. Security+ Guide to Network Security Fundamentals [ada CD]Paul Campbell, Ben Calvert, Steven Boswell. Thomson Learning, 2003.
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