M.Kh. Nazirov. “SOCIO-ECONOMIC, CULTURAL AND POLITICAL DEVELOPMENT OF THE SECOND BULGARIAN KINGDOM IN THE XI-XIV CENTURIES”. Oriental Journal of Social Sciences 2, no. 06 (December 26, 2022): 89–97. Accessed June 27, 2025. https://supportscience.uz/index.php/ojss/article/view/430.