@book { ControllingalsManagementuntersttzendesSystem,
    title = "Controlling als Managementunterstützendes System",
    author = "Björn {Zschommler}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640095469",
    url = "https://www.hausarbeiten.de/document/111495"
}