O'Leary, T. J., & O'Leary, L. I. (1998). Computing essentials, 1998-1999 (Annual ed.). McGraw-Hill/Irwin.
Lua i Stíl Chicago (17ú heag.)O'Leary, Timothy J., agus Linda I. O'Leary. Computing Essentials, 1998-1999. Annual ed. Boston, MA: McGraw-Hill/Irwin, 1998.
Lua MLA (8ú heag.)O'Leary, Timothy J., agus Linda I. O'Leary. Computing Essentials, 1998-1999. Annual ed. McGraw-Hill/Irwin, 1998.
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