Cita APA

Helgesen, M., & Brown, S. (1994). Active listening: Building skills for understanding : student's book 2. Cambridge: Cambridge University Press.

Citación estilo Chicago

Helgesen, Marc, y Steven Brown. Active Listening: Building Skills for Understanding : Student's Book 2. Cambridge: Cambridge University Press, 1994.

Cita MLA

Helgesen, Marc, y Steven Brown. Active Listening: Building Skills for Understanding : Student's Book 2. Cambridge: Cambridge University Press, 1994.