著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL Cisco Networking Academy,IT essentials : PC hardware and software companion guide,4th ed,Cisco Press,2011,Cisco networking academy series,,9781587132636,,https://cir.nii.ac.jp/crid/1130282271829442816