Hahner, J. C. (2002). Speech Lab CD to accompany: Speaking clearly. New York: McGraw-Hill.
Trích dẫn kiểu ChicagoHahner, Jeffrey C. Speech Lab CD to Accompany: Speaking Clearly. New York: McGraw-Hill, 2002.
Deismireacht MLAHahner, Jeffrey C. Speech Lab CD to Accompany: Speaking Clearly. New York: McGraw-Hill, 2002.
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