Voyush, Inha D. “Protoforms of information and communication activities during the reign of Vytautas (the second  half of the XIV – early XV century)”. Journal of the Belarusian State University. Journalism, no. 1 (April 13, 2019): 4–13. Accessed July 18, 2026. https://journals.bsu.by/index.php/journalism/article/view/2329.