1. Abdallah M. S., Sa'ad F. M. etAbbas A. S. (1972): Taxonomical studies in the flora of Egypt. II. Natural flora of Egyptian Nubia before the construction of Aswan High Dam.—Agric. Res. Centre, Herbarium, Techn. Bull. no. 4, Cairo, 1971: 1–83.
2. Abd El-Ghani M. M. (1981): Preliminary studies on the vegetation of Bahariya Oasis—Egypt.— 309 p., ms. [M. Sc. Thesis, Botany Dept., Fac. Sci., Cairo Univ.]
3. Abd El-Ghani M. M. (1985): Comparative study on the vegetation of the Bahariya and Farafra Oases and the Faiyum region.—500 p., ms. [PhD Thesis, Botany Dept., Fac. Sci., Cairo Univ.]
4. Ahti T., Hämet-Ahti L. etPetterson B. (1973): Flora of the inundated Wadi Halfa reach of the Nile, Sudanese Nubia, with notes on adjacent areas.—Ann. Bot. Fenn., Helsinki, 10: 131–162.
5. Al-Eisawi D. M. (1982): List of Jordan vascular plants.—Mitt. Bot. Staatssamml. München, 18: 79–182.