@book { EuropischeIntegration,
    title = "Europäische Integration",
    subtitle = "Wirtschaft und Recht, Geschichte und Politik",
    author = "Hans-Jürgen {Wagener} and Thomas {Eger}",
    year = "2014",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221266"
}