Helgesen, M., & Brown, S. (1995). Active listening: Introducing skills for understanding, student's book. Cambridge University.
Citace podle Chicago (17th ed.)Helgesen, Marc, a Steven Brown. Active Listening: Introducing Skills for Understanding, Student's Book. Nueva York: Cambridge University, 1995.
Citace podle MLA (9th ed.)Helgesen, Marc, a Steven Brown. Active Listening: Introducing Skills for Understanding, Student's Book. Cambridge University, 1995.
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