Citação norma APA

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

Citação norma Chicago

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

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.