O'Leary, T. J., & O'Leary, L. I. (1998). Computing essentials, 1998-1999 (Annual ed.). McGraw-Hill/Irwin.

O'Leary, Timothy J., and Linda I. O'Leary. Computing Essentials, 1998-1999. Annual ed. Boston, MA: McGraw-Hill/Irwin, 1998.

O'Leary, Timothy J., and Linda I. O'Leary. Computing Essentials, 1998-1999. Annual ed. McGraw-Hill/Irwin, 1998.