Hobbs, H. F. C. “Notes on Jebel Marra, Darfur.” The Geographical Journal, vol. 52, no. 6, 1918, pp. 357–63. JSTOR, https://doi.org/10.2307/1780270 . Accessed 31 Jan. 2024.
jstor.org
Hammerton, D. "Recent Discoveries in the Caldera of Jebel Marra".Sudan Notes and Records, vol. 49, 1968, pp. 136-48. JSTOR, http://www.jstor.org/stable/41716898.