@book { NationalsozialismusimUnterrichtderSekundarstufeI, title = "Nationalsozialismus im Unterricht der Sekundarstufe I", author = "Dieter {Nelles}", year = "2015", publisher = "BACHELOR + MASTER PUBLISHING", address = "Hamburg, Deutschland", url = "https://m.bachelor-master-publishing.de/document/297672" }