@book { Glcksmomente,
    title = "Glücksmomente",
    author = "Martina {Rühl}",
    year = "2020",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/921232"
}