@book { AfghanistanEinsatzderBundeswehrProundContra,
    title = "Afghanistan-Einsatz der Bundeswehr. Pro und Contra",
    author = "Julian {Kühnel}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656558385",
    url = "https://www.hausarbeiten.de/document/266041"
}