1. The Geology of Egypt;Said,1990
2. B. Peng, Andrew, R. Zhaoliang, S. Changxun, Y. Xiaoyan, T. Shurong, X. Xianglin T. Tan, C., 51, 2014, 191-203.
3. G.I., Spanderashvilli, Mansour, M., The Egyptian phosphorites, in: Moharram, O. (ed.), Studies on Some Mineral Deposits of Egypt, 1970, 89–90.
4. Origin of Late Cretaceous phosphorites in Egypt
5. Raman investigations of Upper Cretaceous phosphorite and black shale from Safaga District, Red Sea, Egypt;Ciobota;Spectrochim. Acta A,2014