@book { ImplementierungeinesinternenKontrollsystemsimProvisionsexkasso,
    title = "Implementierung eines internen Kontrollsystems im Provisionsexkasso",
    author = "Angelina {Jung}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842822467",
    url = "https://m.diplom.de/document/228687"
}