@book { SocialEntrepreneurshipinDeutschlandEinModellfrdieZukunft, title = "Social Entrepreneurship in Deutschland: Ein Modell für die Zukunft?", author = "Patrick {Weirich}", year = "2015", publisher = "BACHELOR + MASTER PUBLISHING", address = "Hamburg, Deutschland", url = "https://m.bachelor-master-publishing.de/document/298067" }