@book { LebudgetcommunautairedelUnioneuropenne,
    title = "Le budget communautaire de l’Union européenne ",
    author = "Jessica {Mohr}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640349784",
    url = "https://www.hausarbeiten.de/document/127112"
}