@book { DarstellungundBeschreibungimmateriellerAnreizsystemeimManagement,
    title = "Darstellung und Beschreibung immaterieller Anreizsysteme im Management",
    author = "Jens {Elfgen}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832499730",
    url = "https://m.diplom.de/document/224872"
}