DURAJ, Natasza. The Volga and its importance for the economic and social development of Russia: Part 1. The earliest history. Poland: Lodz University Press,2026. DOI: 10.18778/8445-067-3. Disponível em: https://press.uni.lodz.pl/index.php/wul/catalog/book/1776. Acesso em: 1 sep. 2026.