2009, Part of book or chapter of book (Kuhl, S.; Strodtholz, P.; Taffertshofer, A. (ed.), Handbuch Methoden der Organisationsforschung: Quantitative und Qualitative Methoden, pp. 628-646)
2009, Part of book or chapter of book (Withworth, B; Moor, A de (ed.), Handbook of Research on Socio-Technical Design and Social Networking Systems, pp. 429-439)