APA (7th ed.) Citation

Microsoft Corporation. Microsoft operating system 2 programmer's reference: Version 1.1.

Chicago Style (17th ed.) Citation

Microsoft Corporation. Microsoft Operating System 2 Programmer's Reference: Version 1.1. Redmond, Wash.

MLA (9th ed.) Citation

Microsoft Corporation. Microsoft Operating System 2 Programmer's Reference: Version 1.1.

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