Cita APA (7th ed.)

(1988). IBM using disk operating system version 4.00. Perfect Bound Pub.

Cita Chicago (17th ed.)

IBM Using Disk Operating System Version 4.00. Quezon City: Perfect Bound Pub, 1988.

Cita MLA (9th ed.)

IBM Using Disk Operating System Version 4.00. Perfect Bound Pub, 1988.