APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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