Cita APA

Helgesen, M., & Brown, S. (1994). Active listening: Building skills for understanding, student's book (1a. ed.). Cambridge University.

Citación estilo Chicago

Helgesen, Marc, and Steven Brown. Active Listening: Building Skills for Understanding, Student's Book. 1a. ed. Cambridge: Cambridge University, 1994.

Cita MLA

Helgesen, Marc, and Steven Brown. Active Listening: Building Skills for Understanding, Student's Book. 1a. ed. Cambridge University, 1994.