Cita APA (7th ed.)

HELD GILBERT. (1987). IBM PC AND PC XT USER`S REFERENCE MANUAL (2.). BPB PUBLICATIONS.

Cita Chicago (17th ed.)

HELD GILBERT. IBM PC AND PC XT USER`S REFERENCE MANUAL. 2. DELHI: BPB PUBLICATIONS, 1987.

Cita MLA (9th ed.)

HELD GILBERT. IBM PC AND PC XT USER`S REFERENCE MANUAL. 2. BPB PUBLICATIONS, 1987.