FRENZEL. (1995). Communication Electronics Frenzel. Glencoe MacMillan.
Lua i Stíl Chicago (17ú heag.)FRENZEL. Communication Electronics Frenzel. Glencoe MacMillan, 1995.
Lua MLA (8ú heag.)FRENZEL. Communication Electronics Frenzel. Glencoe MacMillan, 1995.
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