Gaya APA

Helgesen, M., Brown, S. (1999). Active listening building : skills for understanding / Marc Helgesen (Cet. 7). Cambridge: Cambridge University Perss.

Gaya MLA

Helgesen, Marc., Brown, Steven.. "Active listening building : skills for understanding / Marc Helgesen". Cet. 7 Cambridge: Cambridge University Perss, 1999. Buku.