@book { KonzeptionundAbgrenzungvonKundenControlling,
    title = "Konzeption und Abgrenzung von Kunden-Controlling",
    author = "Peggy {Rapko}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832447496",
    url = "https://m.diplom.de/document/220344"
}