Cita APA (7th ed.)

Microsoft Corporation. (1994). User's guide Microsoft MS-DOS 6.21 for the MS-DOS operating system. Microsoft.

Cita Chicago (17th ed.)

Microsoft Corporation. User's Guide Microsoft MS-DOS 6.21 for the MS-DOS Operating System. [Washington]: Microsoft, 1994.

Cita MLA (9th ed.)

Microsoft Corporation. User's Guide Microsoft MS-DOS 6.21 for the MS-DOS Operating System. Microsoft, 1994.