@book { DiagnoseInsomnieSchlafstrung,
    title = "Diagnose Insomnie - Schlafstörung",
    author = "Holger {Kiefer}",
    year = "2023",
    publisher = "Heil-Weg-Verlag",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1405867"
}