@book { NatrlichdurchdieWechseljahre,
    title = "Natürlich durch die Wechseljahre",
    author = "Claudia {Ritter}",
    year = "2020",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/924927"
}