@book { DieBesonderheitenderstrategischenPlanunginNonprofitOrganisationen,
    title = "Die Besonderheiten der strategischen Planung in Nonprofit-Organisationen",
    author = "Marc {Sieper}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836608183",
    url = "https://m.diplom.de/document/225504"
}