FREEMAN, R. L. (1993). Reference Manual For Telcomunications Engineering Roger L. Freeman. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)FREEMAN, Roger L. Reference Manual For Telcomunications Engineering Roger L. Freeman. John Wiley & Sons, 1993.
Lua MLA (8ú heag.)FREEMAN, Roger L. Reference Manual For Telcomunications Engineering Roger L. Freeman. John Wiley & Sons, 1993.
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