Helgesen. (1996). Active listening expanding: Understanding through content - Level 3. Cambridge: Cambridge University Press.
Čikaški stil citiranjaHelgesen. Active Listening Expanding: Understanding Through Content - Level 3. Cambridge: Cambridge University Press, 1996.
MLA način citiranjaHelgesen. Active Listening Expanding: Understanding Through Content - Level 3. Cambridge: Cambridge University Press, 1996.
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