@book { DasgeheimeTagebuchderPDL,
    title = "Das geheime Tagebuch der P.D.L.",
    author = "Paula Dorothea {Ludowich}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403738"
}