Dyfyniad APA

(1988). IBM disk operating system, version 4.0. Perfect Bound Pub.

Dyfyniad Arddull Chicago

IBM Disk Operating System, Version 4.0. Quezon City: Perfect Bound Pub, 1988.

Dyfyniad MLA

IBM Disk Operating System, Version 4.0. Perfect Bound Pub, 1988.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.