Duissembayev А.А., Ussenova Д.М., and Khasenkhanov Н.Б. “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 (January 27, 2023): 170–179. Accessed May 7, 2024. https://bulecon.enu.kz/index.php/main/article/view/404.