O'Leary, T. J. (1991). Computing essentials: Annual Edition 1991-1992. McGraw-Hill.
Chicago-viite (17. p.)O'Leary, Timothy J. Computing Essentials: Annual Edition 1991-1992. New York: McGraw-Hill, 1991.
MLA-viite (9. p.)O'Leary, Timothy J. Computing Essentials: Annual Edition 1991-1992. McGraw-Hill, 1991.
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