HELD GILBERT. (1987). IBM PC AND PC XT USER`S REFERENCE MANUAL (2.). BPB PUBLICATIONS.
Chicago-čujuhus (17. p.)HELD GILBERT. IBM PC AND PC XT USER`S REFERENCE MANUAL. 2. DELHI: BPB PUBLICATIONS, 1987.
MLA-čujuhus (9. p.)HELD GILBERT. IBM PC AND PC XT USER`S REFERENCE MANUAL. 2. BPB PUBLICATIONS, 1987.
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