O'Leary, Timothy J. 1947- Computing essentials 1999-2000 / Timothy J. O' Leary, Linda I. O' Leary - International ed. - Boston, Mass.: Irwin/McGraw-Hill, 1998 - xii, 112 p.: ill.; 28 cm. ISBN: 0073655562 Subjects--Topical Terms: ComputersElectronic data processing