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 L.N. Gumilyov ENU, no. 2 (January 27, 2023): 170–179. Accessed January 20, 2026. https://bulecon.enu.kz/index.php/main/article/view/404.