@book { DieEisenbahnenDeutschlandsundFrankreichs,
    title = "Die Eisenbahnen Deutschlands und Frankreichs",
    author = "Markus {Lang}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105472"
}