@book { MotivationdurchFhrung,
    title = "Motivation durch Führung",
    author = "Bernd {Kogel}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832483135",
    url = "https://m.diplom.de/document/223508"
}