@book { PolitischePartizipationamProzessdereuropischenIntegrationdurchnationaleReferenden,
    title = "Politische Partizipation am Prozess der europäischen Integration durch nationale Referenden",
    author = "Wolfgang {Regler}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640413850",
    url = "https://www.hausarbeiten.de/document/125365"
}