Helgesen M. Marc & Brown S. Steven. (1999). Active Listening. Building. Skills for Understanding: Student's Book 2 (7th ed.). Cambridge, Cambridge University Press, 1999.
Chicago Style (17. basım) AtıfHelgesen M. Marc ve Brown S. Steven. Active Listening. Building. Skills for Understanding: Student's Book 2. 7th ed. Cambridge, Cambridge University Press, 1999, 1999.
MLA (9th ed.) AtıfHelgesen M. Marc ve Brown S. Steven. Active Listening. Building. Skills for Understanding: Student's Book 2. 7th ed. Cambridge, Cambridge University Press, 1999, 1999.
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