RAK, Maciej. Listy Izydora Kopernickiego do Seweryna Udzieli z lat 1887–1891. LingVaria, Poland, v. 8, n. 15, p. 227–249, 2013. DOI: 10.12797/LV.08.2013.15.19. Disponível em: https://journals.akademicka.pl/lv/article/view/2924. Acesso em: 1 jun. 2025.