@book { PolesinKaisersArmyOntheFrontoftheFirstWorldWar,
    title = "Poles in Kaiser’s Army On the Front of the First World War",
    author = "Ryszard {Kaczmarek}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16991",
    url = "https://www.peterlang.com/document/1063458"
}