Berg, F. S. (1978). Listening and speech training package. Grune & Stratton.
Lua i Stíl Chicago (17ú heag.)Berg, Frederick S. Listening and Speech Training Package. New York: Grune & Stratton, 1978.
Lua MLA (8ú heag.)Berg, Frederick S. Listening and Speech Training Package. Grune & Stratton, 1978.
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