@book { LogistikDienstleister,
    title = "Logistik-Dienstleister",
    subtitle = "Aufgaben und Bedeutung",
    author = "Laura {Papafragkou}",
    year = "2015",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/298693"
}