Dyfyniad APA

International Business Machines. (1987). Disk operating system (Version 3.30.). International Business Machines.

Dyfyniad Arddull Chicago

International Business Machines. Disk Operating System. Version 3.30. Boca Raton, Fla: International Business Machines, 1987.

Dyfyniad MLA

International Business Machines. Disk Operating System. Version 3.30. International Business Machines, 1987.

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