APA (7th ed.) Citation

(1986). Microsoft MS-DOS 4.0 operating system: System overview. Microsoft Corporation.

Chicago Style (17th ed.) Citation

Microsoft MS-DOS 4.0 Operating System: System Overview. [S.1.]: Microsoft Corporation, 1986.

MLA (9th ed.) Citation

Microsoft MS-DOS 4.0 Operating System: System Overview. Microsoft Corporation, 1986.

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