1. Abu Ali, Mansour Hamdi, Geography of Dry Areas, Dar Wael Publishing, 1st Edition, Amman, Jordan, 2010.
2. Al-Budairi, Ahmed Lafta, indicators of climate change and their impact on increasing the manifestations of drought in the province of Babylon, a master’s thesis (unpublished), College of Education, Ibn Rushd, University of Baghdad, 2012.
3. Jassim, Radhia Abdullah, Determining the Drought Phenomenon in the Kurdistan Region of Iraq, Master’s Thesis (unpublished), Salah al-Din University, 2012.
4. Handbook of Drought Management Indicators and Indicators, Integrated Drought Management Programme, World Meteorological Organization (WMO, National Drought Mitigation Center (NDMC) for the state of Nebraska, 2016 Publications, p. 17).
5. Al-Zubaidi, Halima Ibrahim, assessing drought conditions using remote sensing technology, an applied study on the western regions of Taif Governorate, Saudi Arabia, Journal of Arts and Social Sciences, Sultan Qaboos University, Sultanate of Oman, 2015.