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سطر 57:
* [http://distantwriting.co.uk/ Distant Writing] — The History of the Telegraph Companies in Britain between 1838 and 1868
* [http://siris-archives.si.edu/ipac20/ipac.jsp?uri=full=3100001~!140235!0 Western Union Telegraph Company Records, 1820–1995] Archives Center, National Museum of American History, Smithsonian Institution.
* [http://technikum29.de/en/communication/fax Early telegraphy and fax engineering, still operable in a German computer museum] {{wayback|url=http://technikum29.de/en/communication/fax |date=20120420040611 }}
* [https://www.nytimes.com/2006/02/06/technology/06telegram.html?scp=1&sq=Telegram%20Falls%20Silent%20Stop%20Era%20Ends%20Stop&st=Search "Telegram Falls Silent Stop Era Ends Stop"], نیو یارک ٹائمز، February 6, 2006
* [http://www.scribd.com/doc/123278691/International-Communications-Facilities-of-the-American-Carriers International Facilities of the American Carriers] - an overview of the U.S. international cable network in 1950
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