1. Understanding attitudes and predicting social behavior;Ajzen,1980
2. The theory of planned behavior;Ajzen;Organizational Behavior and Human Decision Processes,1991
3. Free-to-Play games: professionals’ perspectives;Alha,2014
4. Critical acclaim and commercial success in mobile free-to-Play games;Alha,2016
5. Hearts, clubs, diamonds spades: players who suit MUDs [Online];Bartle,1996