Helgesen, M., Brown, S., & Smith, D. (1999). Active listening: Expanding understanding through content : Level 3 [Đĩa CD-ROM]. Cambridge: Cambridge University Press.
シカゴスタイル引用形Helgesen, Marc, Steven Brown, , Dorolyn Smith. Active Listening: Expanding Understanding Through Content : Level 3 [Đĩa CD-ROM]. Cambridge: Cambridge University Press, 1999.
MLA引用形式Helgesen, Marc, Steven Brown, , Dorolyn Smith. Active Listening: Expanding Understanding Through Content : Level 3 [Đĩa CD-ROM]. Cambridge: Cambridge University Press, 1999.
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