Orwing, G. W. (1984). The computer tutor: IBM personal computer edition: learning Activities for the IBM PC and PCjr. Little, Brown.
Chicago-viite (17. p.)Orwing, Gary W. The Computer Tutor: IBM Personal Computer Edition: Learning Activities for the IBM PC and PCjr. Little, Brown, 1984.
MLA-viite (9. p.)Orwing, Gary W. The Computer Tutor: IBM Personal Computer Edition: Learning Activities for the IBM PC and PCjr. Little, Brown, 1984.
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