Williams, Martin A.J.; Talbot, Michael R. (2009). "Late Quaternary Environments in the Nile Basin". The Nile. Monographiae Biologicae. Vol. 89. pp. 61–72. doi:10.1007/978-1-4020-9726-3_4. ISBN978-1-4020-9725-6.
Walker, Stephen (8 October 2013). "Gilf Kebir". Orbit: Earth's Extraordinary Journey. Archived from the original on August 25, 2013. Retrieved 20 December 2013.