Terracciano, Achille, and Romualdo Pirotta. “Escursione Saati-Keren-Gheleb-Asmara”. Bollettino della Società Geografica Italiana (December 31, 1893): 384–387. Accessed October 13, 2026. https://www.bsgi.it/index.php/bsgi/article/view/4035.