Helgesen, M. (2007). Practical English language teaching: Listening. New York: McGraw-Hill.
シカゴスタイル引用形Helgesen, Marc. Practical English Language Teaching: Listening. New York: McGraw-Hill, 2007.
MLA引用形式Helgesen, Marc. Practical English Language Teaching: Listening. New York: McGraw-Hill, 2007.
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