IRE Professional Group on Audio. (1951). IRE Transactions on Audio. Institute of Radio Engineers.
Lua i Stíl Chicago (17ú heag.)IRE Professional Group on Audio. IRE Transactions on Audio. New York: Institute of Radio Engineers, 1951.
Lua MLA (8ú heag.)IRE Professional Group on Audio. IRE Transactions on Audio. Institute of Radio Engineers, 1951.
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