Welker, M. (2008). Review: Ullrich Dittler, Michael Kindt & Christine Schwarz (Eds.) (2007). Online-Communities als soziale Systeme. Wikis, Weblogs und Social Software im E-Learning [Online-Communities as Social Systems: Wikis, Weblogs and Social Software in E-Learning]. Forum Qualitative Sozialforschung Forum: Qualitative Social Research, 9(1). https://doi.org/10.17169/fqs-9.1.370