Boldyreva, S. B., D. B. Batyreva, B. A. Natyrova, D. N. Batyrev, and O. A. Tsedinov. “The Peculiarities of the Market of Tourist and Hotel Services in Modern Russia”. Amazonia Investiga, vol. 7, no. 17, Dec. 2018, pp. 150-64, https://amazoniainvestiga.info/index.php/amazonia/article/view/339.