Skotnicki, Krzysztof. “Institution of the Poll Watcher in the Polish Electoral Law in the Interwar Period: Https: doi.Org 10.26485 SW 2018 25 7”. Studia Wyborcze, vol. 25, May 2019, pp. 85-93, https://czasopisma.ltn.lodz.pl/Studia-Wyborcze/article/view/417.