@book { KriegsgefangenschaftanderOstfront1914bis1918,
    title = "Kriegsgefangenschaft an der Ostfront 1914 bis 1918",
    author = "Reinhard {Nachtigal}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1098369"
}