“Gamification at Work”, Kumar & Herger, 2013. A practical, introductory book about the mechanics of gamification, their underlying design principles and – most importantly – their limitations. Includes also a curated list of examples and a categorized bibliography. A good place to start for MA level students and design professionals. The free ebook version can be downloaded from the link below.
Ebook: https://www.interaction-design.org/books/gamification_at_work.html