Duissembayev А. .; Ussenova Д.; Khasenkhanov Н. . 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, [S. l.], n. 2, p. 170–179, 2023. Disponível em: https://bulecon.enu.kz/index.php/main/article/view/404. Acesso em: 21 jan. 2026.