APA (7th ed.) Citation

GUIDE, U. Microsoft MS-DOS: Operating system, user guide. Microsoft Corporation.

Chicago Style (17th ed.) Citation

GUIDE, USER. Microsoft MS-DOS: Operating System, User Guide. Microsoft Corporation.

MLA (8th ed.) Citation

GUIDE, USER. Microsoft MS-DOS: Operating System, User Guide. Microsoft Corporation.

Warning: These citations may not always be 100% accurate.