Sawyer, Stacey C Using infor mation tchnology : a practial introduction to computers and communecations / Stacey C Sawyer - 2nd ed. - Boston : Mc Graw Hill, c1997. - xxx,330 p. : Includes index. ISBN: 0256209804 LCCN: Subjects--Topical Terms: ComputersTelecommunications systemsInformation techonlogy LC Class. No.: QA76 / .5 1997