@book { ControllingundseineInstrumenteinNonprofitOrganisationen,
    title = "Controlling und seine Instrumente in Nonprofit-Organisationen",
    author = "David {Schmidt}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297937"
}