@book { Weihnachtenhartzart, title = "Weihnachten hart + zart", subtitle = "24 und eine Geschichte von acht Autoren", author = "Christoph {Ernst} and Autorengruppe {Blut und Feder}", year = "2016", publisher = "Bedey Media GmbH", address = "Hamburg, Deutschland", url = "https://kaderaverlag.openpublishing.com/document/318365" }