1. T.A. Mahmood, 1988. Environmental science and technology. University of Mousel.
2. Ibrahim S. Al-Mutaz, Mohammad A. Al-Ghunaimi. 2001 “ Performance of Reverse Osmosis Units at High Temperatures ,The IDA world congress on desalination and water reuse Bahrain.
3. Takashi Asano, Franklin L. Burton, Harold L. Leverenz, Ryujiro Tsuchihashi, and George Tchobanoglous. 2007 “Water Reuse” First Edition McGraw-Hill
4. FilmTec™ Reverse Osmosis Membranes Technical Manual ,2020 https://www.dupont.com/content/dam/dupont/amer/us/en/water-, solutions/public/documents/en/45-D01504-en.pdf.
5. Abbas Hadi Abbas, 2017 Softening of Groundwater in Tikrit University – Iraq by Using Reverse Osmosis Membrane Technique Journal of Environmental Studies [JES] (17). 1-10.