@book { DemotivationUrsachenEntwicklungenAuswirkungen,
    title = "Demotivation - Ursachen, Entwicklungen, Auswirkungen",
    author = "Julia {Kahle-Hausmann}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832499587",
    url = "https://m.diplom.de/document/225074"
}