Dubman , Eduard L. “On the Question of Studying, Preservation and Popularization of Fortification Sites of the Southern Middle Volga Region Borderland of the Late XVI – Early XVIII Centuries”. Arkheologiia Evraziiskikh Stepei (Archaeology of the Eurasian Steppes), no. 6 (December 31, 2023): 37–51. Accessed November 7, 2026. https://evrazstep.ru/index.php/aes/article/view/1136.