1. https://data.worldbank.org/indicator/SP.POP.GROW?locations=SA
2. https://www.water-technology.net/projects/ras-al-khair-desalination-plant.
3. Investment for Capacity Expansion;Manne,1967
4. Time-capacity expansion of urban water systems
5. Staging of Investment in Desalination Facilities and Associated Storage Facilities;Shuhaibar,1972