@book { ControllingvonNonprofitOrganisationen,
    title = "Controlling von Nonprofit-Organisationen",
    author = "Markus {Farnung}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638456319",
    url = "https://www.hausarbeiten.de/document/49098"
}