Casson, H. N. (1910). The history of the telephone. A. C. McClurg & co.
Lua i Stíl Chicago (17ú heag.)Casson, Herbert Newton. The History of the Telephone. Chicago: A. C. McClurg & co, 1910.
Lua MLA (9ú heag.)Casson, Herbert Newton. The History of the Telephone. A. C. McClurg & co, 1910.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.