@book { DieTtigkeitsbereichedesCenterManagers,
    title = "Die Tätigkeitsbereiche des Center Managers",
    author = "Peter {Lechner}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832481162",
    url = "https://m.diplom.de/document/223341"
}