@book { BeyondBudgeting,
    title = "Beyond Budgeting",
    author = "Ramona {Rozsa}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832483111",
    url = "https://m.diplom.de/document/223506"
}