1. 1. F. Gumprecht, Die Reise des Pater Krump nach Nubien in den Jahren 1700-1702 und dessen Mittheilungen uber Abyssinien ,Monatsber. Verhandl. Ges. Erdkunde Berlin, n.s., 7 (1850 ), 39 -88 .
2. The Road to Chephren's Quarries
3. 3. L Ball, On the Topographical and Geological Results of a Reconnaisance-Survey of Jebel Garra and the Oasis Kurkur (Geological Survey of Egypt, Cairo, 1902 ), 40 pp.