@book { DieEntwicklungundBedeutungdesPersonalmanagements,
    title = "Die Entwicklung und Bedeutung des Personalmanagements",
    author = "Jessica {Jahn}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832474843",
    url = "https://m.diplom.de/document/222750"
}