APA (7th ed.) Citation

Microsoft Corporation. (1993). Microsoft windows and MS-DOS 6: User's guide. Microsoft.

Chicago Style (17th ed.) Citation

Microsoft Corporation. Microsoft Windows and MS-DOS 6: User's Guide. [Redmond, Wash.]: Microsoft, 1993.

MLA (9th ed.) Citation

Microsoft Corporation. Microsoft Windows and MS-DOS 6: User's Guide. Microsoft, 1993.