Dirksen, C. (1997). Educator's English: Speaking and listening for Vietnamese teachers. [s.n.]: English Language Institute.
Chicago-tyylinen lähdeviittausDirksen, Carolyn. Educator's English: Speaking and Listening for Vietnamese Teachers. [s.n.]: English Language Institute, 1997.
MLA-viiteDirksen, Carolyn. Educator's English: Speaking and Listening for Vietnamese Teachers. [s.n.]: English Language Institute, 1997.
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