O'Leary, Timothy J. Computing essentials 1992-1993 / Timothy J. O'Leary, Brian K. Williams, Linda I. O'Leary - New York : Mitchell McGraw-Hill , 1993 - xviii, 270p. : ill. ; 26 cm. Includes index ISBN: 007048841X Subjects--Topical Terms: Procesamiento electrónico de datos LC Class. No.: QA 76 / 054 1993