Here are some of the references that will come in handy if you intend to read in detail about topics mentioned in the book.
Gamification Wiki: http://www.gamification.org/
Leading source for gamification news and information: http://www.gamification.co/
Gamification summit: http://gsummit.com/
Gamification course by Coursera and University of Penn: https://www.coursera.org/course/gamification
Get certified in gamification: http://gamificationu.com/
The Bartle's Test of Gamer Psychology: http://www.gamerdna.com/quizzes/bartle-test-of-gamer-psychology
Resources on the gamification of education: http://www.gamifyingeducation.org/
Gamification of education info graphic: http://www.knewton.com/gamification-education/
MySQL resources and download: http://www.mysql.com/
A free software tool written...