Al-Sammarraie, Maha Abdulsattar, L. Salam Jaafar Azeez, y A.l. Haider Dheyaa Salman. 2020. «Employment of Hotel Classification to Increase Tourist Demand in the Holy Province of Karbala Period 2010-2017». Utopía Y Praxis Latinoamericana 25 (1), 407-19. https://produccioncientificaluz.org/index.php/utopia/article/view/31954.