@book { FinanzwissenschaftIITheoriederBesteuerung,
    title = "Finanzwissenschaft  II: Theorie der Besteuerung",
    author = "Dietmar {Wellisch} and Elke {Baumann}",
    year = "2014",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220933"
}