Distinguishing addiction and high engagement in the context of online game playing. - John P. Charlton; Ian D. W. Danforth (Comput. Hum. Behav., 2007)

Validating the distinction between computer addiction and engagement: online game playing and personality. - John P. Charlton; Ian D. W. Danforth (Behav. Inf. Technol., 2010)