@book { PersonalbindungimdemografischenWandel,
    title = "Personalbindung im demografischen Wandel",
    author = "Ina {Middeldorf}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842811195",
    url = "https://m.diplom.de/document/228378"
}