@book { JobbrsenimInternet,
    title = "Jobbörsen im Internet",
    author = "Sirin {Güngül}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832448745",
    url = "https://m.diplom.de/document/220443"
}