KENNEDY, G. (1984). ELECTRONIC COMMUNICATIONS SYSTEMS 3RD ED. MC GRAW HILL.
Lua i Stíl Chicago (17ú heag.)KENNEDY, GEORGE. ELECTRONIC COMMUNICATIONS SYSTEMS 3RD ED. NEW YORK: MC GRAW HILL, 1984.
Lua MLA (9ú heag.)KENNEDY, GEORGE. ELECTRONIC COMMUNICATIONS SYSTEMS 3RD ED. MC GRAW HILL, 1984.
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