Source: https://www.amazon.com/Gamify-Your-Classroom-Game-Based-Epistemologies/dp/1433126702/ref=as_li_ss_tl?s=books&ie=UTF8&qid=1477252369&sr=1-1&keywords=gamify+your+classroom&linkCode=sl1&tag=learisgrow-20&linkId=f15be01e637a453f59341570ed410e43