Roam, D. (2013). The back of the napkin: Solving problems and selling ideas with pictures ; [with update on drawing tools for iPad, Android and Windows Surface] (Expanded ed., paperback ed.). Portfolio, Penguin.
Chicago Style (17th ed.) CitationRoam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas with Pictures ; [with Update on Drawing Tools for IPad, Android and Windows Surface]. Expanded ed., paperback ed. New York, NY [u.a.]: Portfolio, Penguin, 2013.
MLA (9th ed.) CitationRoam, Dan. The Back of the Napkin: Solving Problems and Selling Ideas with Pictures ; [with Update on Drawing Tools for IPad, Android and Windows Surface]. Expanded ed., paperback ed. Portfolio, Penguin, 2013.
Warning: These citations may not always be 100% accurate.