@book { Mitarbeitermotivation,
    title = "Mitarbeitermotivation",
    author = "Jochen {Laufer}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832494247",
    url = "https://m.diplom.de/document/224557"
}