@book { SoentspanntmeinkrankesKind,
    title = "So entspannt mein krankes Kind",
    author = "Elke {Fuhrmann-Wönkhaus}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403385"
}