@book { SchafkopfundDoppelkopf,
    title = "Schafkopf und Doppelkopf",
    author = "Rita {Danyliuk}",
    year = "2017",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/404127"
}