@book { TheOriginsoftheWelfareState,
    title = "The Origins of the Welfare State",
    subtitle = "Polish Social Policy in the Period 1918–1939",
    author = "Paweł {Grata} and Ian {Upchurch}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18508",
    url = "https://www.peterlang.com/document/1163960"
}