APA (7e ed.) Bronvermelding

International Business Machines Corporation. (1987). Disk operating system version 3.30: Reference (Version 3.30.). International Business Machines Corp.

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

International Business Machines Corporation. Disk Operating System Version 3.30: Reference. Version 3.30. International Business Machines Corp, 1987.

Let op: Deze citaties zijn niet altijd 100% accuraat.