@book { DieReformderchinesischenEisenbahn,
    title = "Die Reform der chinesischen Eisenbahn",
    author = "Eike {Langenberg}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836605007",
    url = "https://m.diplom.de/document/225348"
}