@book { WieausTrauerLiebeundDankbarkeitwird,
    title = "Wie aus Trauer Liebe und Dankbarkeit wird",
    author = "Iris {Willecke}",
    year = "2021",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1108906"
}