@book { AngebotskalkulationmitDatenbanken,
    title = "Angebotskalkulation mit Datenbanken",
    author = "Darius {Maloschek}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832485009",
    url = "https://m.diplom.de/document/223705"
}