@book { GuteNachtmitEntspannungundTraumreisen,
    title = "Gute Nacht - mit Entspannung und Traumreisen",
    author = "Volker {Friebel}",
    year = "2020",
    publisher = "Edition Blaue Felder",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1007376"
}