Helgesen, M., & Brown, S. (1999). Active listening: Introducing skills for understanding. Cambridge University Press.

Helgesen, Marc, and Steven Brown. Active Listening: Introducing Skills for Understanding. Cambridge [England] ; New York, NY: Cambridge University Press, 1999.

Helgesen, Marc, and Steven Brown. Active Listening: Introducing Skills for Understanding. Cambridge University Press, 1999.