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/2up18 August 2013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/2up18 August 2013閲覧。.
塩田紳二「国産銘機列伝 : History 「そして、世界標準がやって来た」」『ASCII』第22巻第8号、アスキー、1998年、378-379頁、ISSN03865428。