@book { Fettarmkochengesundessen,
    title = "Fettarm kochen - gesund essen",
    author = "Prof. Dr. med. Klaus-Dieter {Kolenda} and Sylvia {Schuch}",
    year = "2013",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403818"
}