Lua APA (7ú heag.)

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.

Lua i Stíl Chicago (17ú heag.)

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.

Lua MLA (8ú heag.)

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.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.