APA (7th ed.) Citation

(1987). Disk Operating System Version 3.30 User's Guide. The Grange Press.

Chicago Style (17th ed.) Citation

Disk Operating System Version 3.30 User's Guide. The Grange Press, 1987.

MLA (8th ed.) Citation

Disk Operating System Version 3.30 User's Guide. The Grange Press, 1987.

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