Sep 1, 2012

Gamification by Design: Implementing Game Mechanics in Web and Mobile Apps [Paperback]

http://www.amazon.com/gp/product/1449397670/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1449397670&linkCode=as2&tag=enterprisegam-20

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