@book { TheManagersJob,
    title = "The Manager's Job",
    subtitle = "Management - Die Kernkompetenzen",
    author = "Christian {Bleis} and Antje {Helpup}",
    year = "2016",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220985"
}