@book { Fehlzeitenmanagement,
    title = "Fehlzeitenmanagement",
    author = "Frances {Böhlert}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836637077",
    url = "https://m.diplom.de/document/227279"
}