BELTRAMI, V.; ALFANO, I. S. The North-Eastern Area Of Chad: Ennedi Surroundings. Bollettino della Società Geografica Italiana, [S. l.], p. 449–471, 2004. DOI: 10.36253/bsgi-7003. Disponível em: https://www.bsgi.it/index.php/bsgi/article/view/7003. Acesso em: 15 oct. 2026.