Cita APA

Helgesen, M., & Brown, S. (1999). Active listening: Introducing skills for understanding : Level 1 [Đĩa CD-ROM]. Cambridge: Cambridge University Press.

Citación estilo Chicago

Helgesen, Marc, y Steven Brown. Active Listening: Introducing Skills for Understanding : Level 1 [Đĩa CD-ROM]. Cambridge: Cambridge University Press, 1999.

Cita MLA

Helgesen, Marc, y Steven Brown. Active Listening: Introducing Skills for Understanding : Level 1 [Đĩa CD-ROM]. Cambridge: Cambridge University Press, 1999.