Gaya APA

Becker, E, F., Wortmann, J. (2009). Mastering communication at work : how to lead, manage and influence . New York: McGraw-Hill.

Gaya MLA

Becker, Ethan, F.., Wortmann, Jon. "Mastering communication at work : how to lead, manage and influence". New York: McGraw-Hill, 2009. Text.