@book { DasImagederInternenRevision,
    title = "Das Image der Internen Revision",
    author = "Jörg {Schließer}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832414023",
    url = "https://m.diplom.de/document/217262"
}