@book { WirtschaftsprfunginderKrise,
    title = "Wirtschaftsprüfung in der Krise",
    author = "Jakub {Flieger}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842814295",
    url = "https://m.diplom.de/document/228281"
}