Tercan , T., and G. Yeshenkulova. “Investigation of All-Inclusive System in Hotel Enterprises in Terms of Waste”. Economic series of the Bulletin of L.N. Gumilyov ENU, no. 3 (January 25, 2023): 212–224. Accessed January 21, 2026. https://bulecon.enu.kz/index.php/main/article/view/342.