@book { QuellesEuropesWhichEuropes,
    title = "Quelle(s) Europe(s) ? / Which Europe(s)?",
    subtitle = "Nouvelles approches en histoire de l’intégration européenne / New Approaches in European Integration History",
    author = "Katrin {Rücker} and Laurent {Warlouzet}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    url = "https://www.peterlang.com/document/1106019"
}