@book { DieEUDienstleistungsrichtlinie,
    title = "Die EU-Dienstleistungsrichtlinie",
    author = "René {Reuer}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842804371",
    url = "https://m.diplom.de/document/228039"
}