Cita APA

Helgesen M. Marc & Brown S. Steven. (1999). Active Listening. Introducing. Skills for Understanding: Student's Book 1 (3rd ed.). Cambridge, Cambridge University Press, 1999.

Citación estilo Chicago

Helgesen M. Marc and Brown S. Steven. Active Listening. Introducing. Skills for Understanding: Student's Book 1. 3rd ed. Cambridge, Cambridge University Press, 1999, 1999.

Cita MLA

Helgesen M. Marc and Brown S. Steven. Active Listening. Introducing. Skills for Understanding: Student's Book 1. 3rd ed. Cambridge, Cambridge University Press, 1999, 1999.