Roam, D. (2009). The back of the napkin: Solving problems and selling ideas with pictures. Marshall Cavendish.
Lua i Stíl Chicago (17ú heag.)Roam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas with Pictures. London: Marshall Cavendish, 2009.
Lua MLA (9ú heag.)Roam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas with Pictures. Marshall Cavendish, 2009.
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