O'Brien, J. A. (1986). Study guide: Computers and information processing with software tutorial and basic. Irwin.
Chicago-viite (17. p.)O'Brien, James A. Study Guide: Computers and Information Processing with Software Tutorial and Basic. Homewood: Irwin, 1986.
MLA-viite (9. p.)O'Brien, James A. Study Guide: Computers and Information Processing with Software Tutorial and Basic. Irwin, 1986.
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