Roam, D. (2012). The back of the napkin: Solving problems and selling ideas with pictures. London: Marshall Cavendish Business.
Παραπομπή Chicago StyleRoam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas With Pictures. London: Marshall Cavendish Business, 2012.
Παραπομπή MLARoam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas With Pictures. London: Marshall Cavendish Business, 2012.
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