Cita APA (7th ed.)
Roam, D. (2009). The back of the napkin: Solving problems and selling ideas with pictures. Marshall Cavendish.
Cita Chicago (17th ed.)
Roam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas with Pictures. London: Marshall Cavendish, 2009.
Cita MLA (9th ed.)
Roam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas with Pictures. Marshall Cavendish, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.