@book { VorstandsarbeitimgemeinntzigenVerein,
    title = "Vorstandsarbeit im gemeinnützigen Verein",
    author = "Rüdiger {Marx}",
    year = "2016",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/336826"
}