Helgesen, M. (1999). Active listening: Expanding understanding through content. New York: Cambridge University.
Trích dẫn kiểu ChicagoHelgesen, Marc. Active Listening: Expanding Understanding Through Content. New York: Cambridge University, 1999.
MLA CitationHelgesen, Marc. Active Listening: Expanding Understanding Through Content. New York: Cambridge University, 1999.
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