APA (7th ed.) Citation

DiGiovanna, E. (1991). DOS shareware utilities. Windcrest.

Chicago Style (17th ed.) Citation

DiGiovanna, Ed. DOS Shareware Utilities. Blue Ridge Summit, PA: Windcrest, 1991.

MLA (9th ed.) Citation

DiGiovanna, Ed. DOS Shareware Utilities. Windcrest, 1991.