Helgesen, M., & Brown, S. (1996). Active listening: Introducing skills for understanding (Teacher's ed.). Cambridge University Press.

Helgesen, Marc, and Steven Brown. Active Listening: Introducing Skills for Understanding. Teacher's ed. Cambridge [England] ; New York, NY: Cambridge University Press, 1996.

Helgesen, Marc, and Steven Brown. Active Listening: Introducing Skills for Understanding. Teacher's ed. Cambridge University Press, 1996.