Cita APA (7a ed.)

Helder, C. (2013). The ultimate book of influence: 10 tools of persuasion to connect, communicate and win in business. Wiley.

Cita Chicago Style (17a ed.)

Helder, Chris. The Ultimate Book of Influence: 10 Tools of Persuasion to Connect, Communicate and Win in Business. Milton, Qld.: Wiley, 2013.

Cita MLA (8a ed.)

Helder, Chris. The Ultimate Book of Influence: 10 Tools of Persuasion to Connect, Communicate and Win in Business. Wiley, 2013.