@book { NationenbildungundDemokratie,
    title = "Nationenbildung und Demokratie",
    author = "Norbert {Franz} and Jean-Paul {Lehners}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02461-6",
    url = "https://www.peterlang.com/document/1046790"
}