@book { EntspannungsgeschichtenvomWolkenschloss,
    title = "Entspannungsgeschichten vom Wolkenschloss",
    author = "Volker {Friebel}",
    year = "2019",
    publisher = "Edition Blaue Felder",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1007916"
}