@book { StrategischePlanunginNonprofitUnternehmen,
    title = "Strategische Planung in Nonprofit Unternehmen",
    author = "Norbert {Dawel}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832410339",
    url = "https://m.diplom.de/document/216926"
}