Cita APA (7th ed.)

Helgesen, M., & Brown, S. (1995). Active listening: Introducing skills for understanding, student's book. Cambridge University.

Cita Chicago (17th ed.)

Helgesen, Marc, i Steven Brown. Active Listening: Introducing Skills for Understanding, Student's Book. Nueva York: Cambridge University, 1995.

Cita MLA (9th ed.)

Helgesen, Marc, i Steven Brown. Active Listening: Introducing Skills for Understanding, Student's Book. Cambridge University, 1995.