Cita APA (7th ed.)

Helgesen, M., & Brown, S. Active listening. Buildinging. Skills for understanding (4a ed.).

Cita Chicago (17th ed.)

Helgesen, Marc, i Steven Brown. Active Listening. Buildinging. Skills for Understanding. 4a ed.

Cita MLA (8th ed.)

Helgesen, Marc, i Steven Brown. Active Listening. Buildinging. Skills for Understanding. 4a ed.