@book { Bildungscontrolling,
    title = "Bildungscontrolling",
    author = "Doreen {Krüger}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832453343",
    url = "https://m.diplom.de/document/220898"
}