@book { EUBeitrittderTrkei,
    title = "EU-Beitritt der Türkei",
    author = "Marko {Schulz}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638365796",
    url = "https://www.hausarbeiten.de/document/37150"
}