Παραπομπή APA

Roam, D. (2012). The back of the napkin: Solving problems and selling ideas with pictures. London: Marshall Cavendish Business.

Παραπομπή Chicago Style

Roam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas With Pictures. London: Marshall Cavendish Business, 2012.

Παραπομπή MLA

Roam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas With Pictures. London: Marshall Cavendish Business, 2012.

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