Koplin, M., Skelton, C. (09.2012): „Betaville – a massively participatory mirror world game“ in: Editors: Minhua Ma et al: Serious Games Development and Applications, Springer-Verlag Berlin, Germany, ISBN: 978-3-642-33686-7
Koplin, M., Skelton, C. (09.2012): „Betaville – a massively participatory mirror world game“ in: Editors: Minhua Ma et al: Serious Games Development and Applications, Springer-Verlag Berlin, Germany, ISBN: 978-3-642-33686-7