@book { DemografischerWandelberdieBedeutungdesAltersineineralterndenGesellschaft, title = "Demografischer Wandel: Über die Bedeutung des Alters in einer alternden Gesellschaft", author = "Sarah {Wölke}", year = "2015", publisher = "BACHELOR + MASTER PUBLISHING", address = "Hamburg, Deutschland", url = "https://m.bachelor-master-publishing.de/document/296804" }