“A. Westerfeld’s Drawing ‘Meeting of Bohdan Khmelnytsky’s Ambassadors With Janusz Radziwill’ As a Historical Source”. V. N. Karazin Kharkiv National University Bulletin History of Ukraine. Ukrainian Studies: Historical and Philosophical Sciences, vol. 40, June 2025, pp. 6-17, https://doi.org/10.26565/2227-6505-2025-40-01.