@book { Dauernervosittberwinden,
    title = "Dauernervosität überwinden",
    author = "Dr. Sabine {Nunius} and Christian {Koch}",
    year = "2023",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1390767"
}