Duissembayev А. ., Ussenova Д., and Khasenkhanov Н. . “Problems of Economic and Environmental Aspects in the Field of Sustainable Development of Hotel Services”. ECONOMIC Series of the Bulletin of the L N Gumilyov ENU, no. 2, Jan. 2023, pp. 170-9, https://bulecon.enu.kz/index.php/main/article/view/404.