Estimating the function of tourism demand in Sudan (1990-2018). مجلة جامعة سرت للعلوم الانسانية, [S. l.], v. 12, n. 2, p. 21–01, 2022. DOI: 10.37375/sujh.v12i2.177. Disponível em: https://elc2.su.edu.ly/index.php/humanities/article/view/177. Acesso em: 8 dec. 2025.