Schröder, H. D.; Hasebrink, U.; Dreyer, S.; Loosen, W.; Schröter, F. (2011): Mapping Digital Media: Germany. A Report by the Open Society Foundations (pdf-Datei).
Schröder, H. D.; Hasebrink, U.; Dreyer, S.; Loosen, W.; Schröter, F. (2011): Mapping Digital Media: Germany. A Report by the Open Society Foundations (pdf-Datei).