Paterson,Tim(June 1983).“A Short History of MS-DOS”.Byte: 246.ISSN0360-5280.//archive.org/stream/byte-magazine-1983-06/1983_06_BYTE_08-06_16-Bit_Designs#page/n245/mode/2up2013年8月18日閲覧。.
Software Developer Caldera sues Microsoft for Antitrust practices alleges monopolistic acts shut its DR DOS operating system out of market Caldera News, 1996-07-24 ([3]).
Paterson,Tim(June 1983).“A Short History of MS-DOS”.Byte: 246.ISSN0360-5280.//archive.org/stream/byte-magazine-1983-06/1983_06_BYTE_08-06_16-Bit_Designs#page/n245/mode/2up2013年8月18日閲覧。.