Ryčkov, Andrej, and Ernestas Vasiliauskas. “Description of the Border of the Grand Duchy of Lithuania and Livonia in 1529”. History / Istorija 127, no. 3 (May 11, 2023): 104–131. Accessed December 22, 2024. https://ejournals.vdu.lt/index.php/istorijoszurnalas/article/view/4686.