Alexander Graham Bell: Béda antarrépisi

*{{en}} [http://histv2.free.fr/bell/bell1.htm Biantara Bell] di hareupeun American Association for the Advancement of Science di [[Boston, Massachusetts|Boston]] dina ping [[27 Agustus]] [[1880]], mintonkeun [[fotopon]]. Dimuat kalayan judul "On the Production and Reproduction of Sound by Light" dina ''American Journal of Sciences'', Third Series, vol. '''XX''', #118, Oktober 1880, kaca 305 - 324; sarta "[[Selenium]] and the Photophone" dina majalah ''[[Nature]]'', Séptember 1880

 

 

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