Helgesen, M., & Brown, S. (1994). Active listening: Building skills for understanding, student's book (1a. ed.). Cambridge University.
Citace podle Chicago (17th ed.)Helgesen, Marc, a Steven Brown. Active Listening: Building Skills for Understanding, Student's Book. 1a. ed. Cambridge: Cambridge University, 1994.
Citace podle MLA (9th ed.)Helgesen, Marc, a Steven Brown. Active Listening: Building Skills for Understanding, Student's Book. 1a. ed. Cambridge University, 1994.
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