@book { GutenachtgeschichtenvomWolkenschloss,
    title = "Gutenachtgeschichten vom Wolkenschloss",
    author = "Volker {Friebel}",
    year = "2019",
    publisher = "Edition Blaue Felder, Tübingen",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1007915"
}