@book { DieEntwicklungderManagementlehre,
    title = "Die Entwicklung der Managementlehre",
    author = "Klaus {Schöfer}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832430986",
    url = "https://m.diplom.de/document/218805"
}