Shelly, Gary B. Essential introduction to computers and how to purchase a personal computer / Gary B. Shelly, Thomas J. Cashman, Jodi Groen - 6th ed. - Boston, Mass. : Thomson/Course Technology, 2006 - 40 p. : col. ill. ; 28 cm. - Shelly Cashman series . ISBN: 0619254890 RM56.30 Subjects--Topical Terms: ComputersComputers--PurchasingComputer science