Tkachenko, Victor. “Mykola Sumtsov’s Contribution to the Study of Pysankas”. V. N. Karazin Kharkiv National University Bulletin ‘History of Ukraine. Ukrainian Studies: Historical and Philosophical Sciences’ 38 (June 18, 2024): 159-167. Accessed July 17, 2024. https://periodicals.karazin.ua/uahistory/article/view/23629.