Lazdiņa, Sanita, Solvita Pošeiko, and Heiko F. Marten. “LINGUISTIC LANDSCAPE OF THE BALTIC STATES: DATA, RESULTS, FUTURE RESEARCH PERSPECTIVES”.
Via Latgalica, no. 5 (December 31, 2013): 39–51. Accessed April 21, 2025.
https://journals.ru.lv/index.php/LATG/article/view/1642.