Gary B. Shelly,Thomas J. Cashman,Misty E. Vermaat.Discovering computers 2001:concepts for a digital world : web enhanced : introductory :数字世界的概念;网络扩展;概论.Course Technology,2002.
Gary B. Shelly,Thomas J. Cashman,Misty E. Vermaat.Discovering computers 2002:concepts for a digital world : web enhanced : introductory :数字世界的概念;网络扩展;概论.Course Technology,2001.