@book { RisikomanagementInstrumentedesControllings,
    title = "Risikomanagement: Instrumente des Controllings",
    author = "Christoph {Ficher}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/296524"
}