@book { DieGeschichteundEntwicklungderEuropischenUnion,
    title = "Die Geschichte und Entwicklung der Europäischen Union",
    author = "Sophia {Marschner}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00652-0",
    url = "https://www.peterlang.com/document/1045732"
}