Gamification. using game-design elements in non-gaming contexts. - Sebastian Deterding; Miguel Sicart; Lennart E. Nacke; Kenton O'Hara; Dan Dixon (CHI Extended Abstracts, 2011)

From game design elements to gamefulness: defining "gamification". - Sebastian Deterding; Dan Dixon; Rilla Khaled; Lennart E. Nacke (MindTrek, 2011)

Designing gamification: creating gameful and playful experiences. - Sebastian Deterding; Staffan Björk; Lennart E. Nacke; Dan Dixon; Elizabeth Lane Lawley (CHI Extended Abstracts, 2013)