Sawyer, Stacey C. Using information technology : a practical introduction to computers & communications : introductory version / Stacey C. Sawyer, Brian K. Williams. - 5th ed. - Boston : McGraw-Hill/Irwin, c2003. - xxvii, 324 p. : col. ill. ; 28 cm. ISBN: 0072484640 LCCN: 2002279948 LC Class. No.: QA76.5 .S2193 2003 / .S2193 2003 Dewey Class. No.: 004