Becker, E. F., & Wortmann, J. (2009). Mastering Communication at Work: How to Lead, Manage, and Influence. McGraw Hill Education.

Becker, Ethan F., and Jon Wortmann. Mastering Communication at Work: How to Lead, Manage, and Influence. New York: McGraw Hill Education, 2009.

Becker, Ethan F., and Jon Wortmann. Mastering Communication at Work: How to Lead, Manage, and Influence. McGraw Hill Education, 2009.