Joint Subcommittee on Development and Research of the Edison Electric Institute and the Bell Telephone System, Edison Electric Institute, & American Telephone and Telegraph Company. Engineering reports. Charles Francis Press.
Lua i Stíl Chicago (17ú heag.)Joint Subcommittee on Development and Research of the Edison Electric Institute and the Bell Telephone System, Edison Electric Institute, agus American Telephone and Telegraph Company. Engineering Reports. New York,: Charles Francis Press.
Lua MLA (8ú heag.)Joint Subcommittee on Development and Research of the Edison Electric Institute and the Bell Telephone System, et al. Engineering Reports. Charles Francis Press.
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