BELIKOVA, H.; SHCHERBAN, A. 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’, v. 40, p. 6-17, 14 Jun. 2025.