Reka cipta telepon: Perbedaan antara revisi
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Baris 27:
* [http://www.loc.gov/exhibits/treasures/trr002.html ''American Treasures of the Library of Congress'', Alexander Graham Bell – Lab notebook I, pages 40–41 (image 22)]
* [http://www.gutenberg.org/dirs/1/3/4/0/13401/13401-h/13401-h.htm#13 Scientific American Supplement No. 520, December 19, 1885]
* [http://www.pacificsites.com/~brooke/TelPat.shtml Telephone Patents] {{Webarchive|url=https://web.archive.org/web/20061021234800/http://www.pacificsites.com/~brooke/TelPat.shtml |date=2006-10-21 }}
=== Paten ===
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