@book { SprechenSielimbisch,
    title = "Sprechen Sie limbisch?",
    author = "Erwin {Böhm}",
    year = "2012",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403779"
}