Williams, Brian K., 1938- Using information technology : a practical introduction to computers & communications / Brian K. Williams, Stacey C. Sawyer. - 9th ed. - London : McGraw-Hill/Irwin, c2011. - xxviii, 577 p. : ill ; 27 cm. Includes bibliographical references and index. ISBN: 9780071221399 Subjects--Topical Terms: Information technology. Dewey Class. No.: 004