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<ref name="Fischer_2000">{{cite web |title=The Evolution of Character Codes, 1874–1968 |author-first=Eric N. |author-last=Fischer |date=2000-06-20 |id=ark:/13960/t07x23w8s |url=https://archive.org/details/enf-ascii |access-date=2020-12-20 |quote=[…] In 1872, [Baudot] started research toward a telegraph system that would allow multiple operators to transmit simultaneously over a single wire and, as the transmissions were received, would print them in ordinary alphabetic characters on a strip of paper. He received a patent for such a system on June 17, 1874. […] Instead of a variable delay followed by a single-unit pulse, Baudot's system used a uniform six time units to transmit each character. […] his early telegraph probably used the six-unit code […] that he attributes to [[Edward Davy|Davy]] in an 1877 article. […] in 1876 Baudot redesigned his equipment to use a five-unit code. Punctuation and digits were still sometimes needed, though, so he adopted from [[David Edward Hughes|Hughes]] the use of two special letter space and figure space characters that would cause the printer to shift between cases at the same time as it advanced the paper without printing. The five-unit code he began using at this time […] was structured to suit his keyboard […], which controlled two units of each character with switches operated by the left hand and the other three units with the right hand. […]}} [https://web.archive.org/web/20180919020435/http://index-of.es/Varios-2/ASCII%20The%20Evolution%20of%20Character%20Codes.pdf][https://archive.org/details/enf-ascii]</ref>
<ref name="MacMillan_2010">{{cite web |title=Codes that Don't Count - Some Printing Telegraph Codes as Products of their Technologies (With Particular Attention to the Teletypesetter) |author-first=David M. |author-last=MacMillan |work=lemur.com |___location=Mineral Point, Wisconsin, USA |version=Revision 3 |date=2010-04-27 |orig-date=2010-04-25, 2010-04-23 |url=http://www.circuitousroot.com/artifice/telegraphy/tty/codes/index.html |access-date=2020-12-20 |url-status=live |archive-url=https://web.archive.org/web/20201218233813/http://www.circuitousroot.com/artifice/telegraphy/tty/codes/index.html |archive-date=2020-12-18}}</ref>
<ref name="ITU_1909">{{cite book |title=Convention télégraphique internationale de Saint-Pétersbourg et Règlement et tarifs y annexés, Revision de Lisbonne, 1908 / Extraits de la publication: Documents de la Conférence télégraphique internationale de Lisbonne |language=fr |date=1909 |orig-date=1908 |___location=Lisbon,
<ref name="ITU_1933_FR">{{cite book |title=Règlement télégraphique annexé à la convention internationale des télécommunications - protocol finale audit règlement - Madrid, 1932 |language=fr |chapter=Chapter IX. Signaux de transmission, Article 35. Signaux de transmission des alphabets télegraphiques internationaux 'nos 1 et 2, signaux d.u code Morse, de l'appareil Hughes et de l'appareil Siemens |___location=Madrid, Spain |publication-place=Berne, Switzerland |publisher=[[Bureau Internationale de L'Union Télégraphique]] |date=1933 |orig-date=1932 |pages=31–40 [33] |url=http://search.itu.int/history/HistoryDigitalCollectionDocLibrary/4.5.43.fr.201.pdf |access-date=2020-12-21 |url-status=live |archive-url=https://web.archive.org/web/20201221011133/http://search.itu.int/history/HistoryDigitalCollectionDocLibrary/4.5.43.fr.201.pdf |archive-date=2020-12-21}} (1+188 pages) [https://web.archive.org/web/20201221012741/https://www.itu.int/en/history/Pages/PlenipotentiaryConferences.aspx?conf=4.5]</ref>
<ref name="ITU_1933_EN">{{cite book |title=Telegraph Regulations Annexed To The International Telecommunication Convention - Final Protocol To The Telegraph Regulations - Madrid 1932 |chapter=Chapter IX. Transmission Signals. Article 35. Transmission Signals of the International Telegraph Alphabets Nos. 1 and 2, Morse Code Signals and Signals of the Hughes and Siemens Instruments. |language=en, fr |date=1933 |orig-date=1932 |id=43-152-2 / 18693 |pages=32–40 [34] |publisher=General Post Office / [[His Majesty's Stationery Office]] |___location=London, UK |url=http://search.itu.int/history/HistoryDigitalCollectionDocLibrary/4.5.43.en.101.pdf |access-date=2020-12-21 |url-status=live |archive-url=https://web.archive.org/web/20201221011748/http://search.itu.int/history/HistoryDigitalCollectionDocLibrary/4.5.43.en.101.pdf |archive-date=2020-12-21}} (1+2*120+26 pages) [https://web.archive.org/web/20201221012741/https://www.itu.int/en/history/Pages/PlenipotentiaryConferences.aspx?conf=4.5]</ref>
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