Corporation, I. B. M. (1987). Disk operating system. Version 3.30. User Guide. International Busines Machines.
Chicago Style (17th ed.) CitationCorporation, International Busines Machines. Disk Operating System. Version 3.30. User Guide. International Busines Machines, 1987.
MLA (8th ed.) CitationCorporation, International Busines Machines. Disk Operating System. Version 3.30. User Guide. International Busines Machines, 1987.
Warning: These citations may not always be 100% accurate.