APA (7e ed.) Bronvermelding

Wolff, J. Focus: Use the power of targeted thinking to get more done : Use the power of targeted thinking to get more done (2.). Pearson Education UK.

Chicago (17e ed.) Bronvermelding

Wolff, Jurgen. Focus: Use the Power of Targeted Thinking to Get More Done : Use the Power of Targeted Thinking to Get More Done. 2. Pearson Education UK.

MLA (8e ed.) Bronvermelding

Wolff, Jurgen. Focus: Use the Power of Targeted Thinking to Get More Done : Use the Power of Targeted Thinking to Get More Done. 2. Pearson Education UK.