@book { EuropeanUnionDiplomacy,
    title = "European Union Diplomacy",
    author = "Dieter {Mahncke} and Sieglinde {Gstöhl}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/978-3-0352-6172-1",
    url = "https://www.peterlang.com/document/1044137"
}