@book { DieGeschichtederKniglichBayerischenGewehrfabrikinAmberg18711918,
    title = "Die Geschichte der Königlich Bayerischen Gewehrfabrik in Amberg (1871-1918)",
    author = "Thomas {Janssens}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106281"
}