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<ref name="MGn8l">Timbs, John; "Year Book of Facts in Science and Art", 1844 edition, p. 55. [https://encrypted.google.com/books?id=YVoAAAAAMAAJ&vq=telephone&pg=PA55#v=onepage&q=telephone&f=false Google Books]</ref>
<ref name="WFroW">[https://archive.org/stream/telephoneandtel00kinggoog/#page/n8/mode/2up The Telephone and Telephone Exchanges] J. E. Kingsbury (1915)</ref>
<ref name="EOBuz">{{cite book|last=Coe|first=Lewis|title=The Telephone and It's Several Inventors: A History|url=https://archive.org/details/telephoneitsseve0000coel|year=1995|publisher=McFarland & Company, Inc.|location=Jefferson, NC|isbn=978-0-7864-2609-6|page=[https://archive.org/details/telephoneitsseve0000coel/page/5 5]}}</ref>
<ref name="qnsxJ">US patent 174465, Alexander Graham Bell: "Improvement in Telegraphy", esitatud 14. veebruaril 1876, rahuldatud 7. märtsil 1876</ref>
<ref name="bArJv">{{cite web|title=Worldwide smartphone user base hits 1 billion|url=http://news.cnet.com/8301-1035_3-57534132-94/worldwide-smartphone-user-base-hits-1-billion/|work=CNet|publisher=CBS Interactive, Inc|author=Don Reisinger}}</ref>