@book { Fhrungssysteme,
    title = "Führungssysteme",
    subtitle = "Strategische Herausforderung für Organisation, Controlling und Personalwesen",
    author = "Jörg {Link}",
    year = "2011",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220834"
}