Cita APA (7th ed.)

Doblelli Rolf. (2013). Art of Thinking Clearly. Sceptre.

Cita Chicago (17th ed.)

Doblelli Rolf. Art of Thinking Clearly. UK: Sceptre, 2013.

Cita MLA (9th ed.)

Doblelli Rolf. Art of Thinking Clearly. Sceptre, 2013.