@book { ThePeopleofPolandatWar19141918,
    title = "The People of Poland at War: 1914-1918",
    subtitle = "Second revised edition",
    author = "Andrzej {Chwalba}",
    year = "2025",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1584996"
}