@book { FallstudienimControlling,
    title = "Fallstudien im Controlling",
    author = "Ernst {Troßmann} and Alexander {Baumeister} and Clemens {Werkmeister}",
    year = "2014",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220885"
}