@book { DerTrumebaum,
    title = "Der Träumebaum",
    author = "Christa {Pleines}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403736"
}