Johnson, D. (1999). Upgrading & repairing your PC answers! McGraw-Hill.
Chicago-viite (17. p.)Johnson, Dave. Upgrading & Repairing Your PC Answers! McGraw-Hill, 1999.
MLA-viite (8. p.)Johnson, Dave. Upgrading & Repairing Your PC Answers! McGraw-Hill, 1999.
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