APA (7th ed.) Citation

Microsoft. (1993). Microsoft MS-DOS 6: For the MS-DOS operating system. Microsoft Corporation.

Chicago Style (17th ed.) Citation

Microsoft. Microsoft MS-DOS 6: For the MS-DOS Operating System. [χ.τ.]: Microsoft Corporation, 1993.

MLA (8th ed.) Citation

Microsoft. Microsoft MS-DOS 6: For the MS-DOS Operating System. Microsoft Corporation, 1993.