@book { Kommunikationshilfen,
    title = "Kommunikationshilfen",
    author = "Nina {Hard}",
    year = "2014",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403868"
}