@book { BWLfrdiePDL,
    title = "BWL für die PDL",
    author = "Birger {Schlürmann}",
    year = "2022",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1224107"
}