Baer, J. (2013). Youtility: Why smart marketing is about help not hype. Portfolio/Penguin.
Lua i Stíl Chicago (17ú heag.)Baer, Jay. Youtility: Why Smart Marketing Is About Help Not Hype. New York, New York: Portfolio/Penguin, 2013.
Lua MLA (9ú heag.)Baer, Jay. Youtility: Why Smart Marketing Is About Help Not Hype. Portfolio/Penguin, 2013.
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