@book { ControllinginderkommunalenVerwaltung,
    title = "Controlling in der kommunalen Verwaltung",
    author = "Markus {Beckmann}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832480080",
    url = "https://m.diplom.de/document/223213"
}