Humennyi, Serhii. “Formation of the Customs System on the «Zbruch Border» (1772–1820s) ”. V. N. Karazin Kharkiv National University Bulletin ‘History of Ukraine. Ukrainian Studies: Historical and Philosophical Sciences’ 40 (June 14, 2025): 18-25. Accessed February 21, 2026. https://periodicals.karazin.ua/uahistory/article/view/26410.