FREEMAN ROGER L. (1998). TELECOMMUNICATIONS TRANSMISSION HANDBOOK (4TH ED.). JOHN WILEY AND SONS INC.
Lua i Stíl Chicago (17ú heag.)FREEMAN ROGER L. TELECOMMUNICATIONS TRANSMISSION HANDBOOK. 4TH ED. NEW YORK: JOHN WILEY AND SONS INC, 1998.
Lua MLA (9ú heag.)FREEMAN ROGER L. TELECOMMUNICATIONS TRANSMISSION HANDBOOK. 4TH ED. JOHN WILEY AND SONS INC, 1998.
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