@book { DieKapitalwertmethodeunddieGrenzenihrerAnwendung,
    title = "Die Kapitalwertmethode und die Grenzen ihrer Anwendung",
    author = "Dietmar {Keitel}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297813"
}