@book { KritischeAnalysemotivationsbedingterFehlzeiten,
    title = "Kritische Analyse motivationsbedingter Fehlzeiten",
    author = "Martin {Hülsmann}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836644433",
    url = "https://m.diplom.de/document/227688"
}