@book { MotivationalsSchlsselfaktorderFreiwilligenarbeitinNonProfitOrganisationen,
    title = "Motivation als Schlüsselfaktor der Freiwilligenarbeit in Non-Profit-Organisationen",
    author = "Renke {Theilengerdes}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842822092",
    url = "https://m.diplom.de/document/228671"
}