@book { ManagementDevelopmentinkleinenundmittlerenUnternehmen,
    title = "Management Development in kleinen und mittleren Unternehmen",
    author = "Manuel {Klöffel}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836643313",
    url = "https://m.diplom.de/document/227632"
}