Schmidt, J.; Dreyer, S.; Lampert, C. (2008): Spielen im Netz. Zur Systematisierung des Phänomens “Online-Games” [Playing on the Net. Systematising the Phenomenon of Online-Games”]. Hamburg (Working papers of the Hans-Bredow-Institut No. 19, pdf-file).
Schmidt, J.; Dreyer, S.; Lampert, C. (2008): Spielen im Netz. Zur Systematisierung des Phänomens “Online-Games” [Playing on the Net. Systematising the Phenomenon of Online-Games”]. Hamburg (Working papers of the Hans-Bredow-Institut No. 19, pdf-file).
2008