1. 1. Jerry M. Neff, Kenneth Lee, Elisabeth M. DeBlois “Produced Water: Overview of Composition, Fates and Effects” January 2011.
   2. K. Guerra, K. Dahm, and S. Dundorf, “Oil and gas produced water management and beneficial use in the Western United States,” U.S. Department of the Interior Bureau of Reclamation, Science and Technology Program Report No. 157, Technical Service Center. Sep. 2011.
   3. J.A. Veil, M.G. Pruder, D. Elcock, and R.J. Redweik, “A White Paper Describing Produced Water from Production of Crude Oil, Natural Gas, and Coal Bed Methane prepared by Argonne National Laboratory for U.S. Department of Energy,” National Energy Technology Laboratory, Jan., 2004.
   4. O.F. Joel, C.A. Amajuoyi, and C.U. Nwokoye, “Characterization of formation water constituents and the effect of fresh water dilution from land rig location of the Niger Delta, Nigeria,” J. Applied Sci. Environ. Management, vol.14, no. 2, pp. 37 – 41, 2010.
   5. R.P.W.M. Jacobs, E. Grant, J. Kwant, J. M. Marqueine and E. Mentzer, “ The composition of produced water from shell operated oil and gas production in the North Sea,” In: J.P. Ray and F.R. Englehart, Eds., Produced Water, Technological /Environmental Issues and Solutions, Plenum Press, New York, pp. 13-21, 1992
   6. Subrata Borgohain Gogoi Ramkrishna Sen, Amarjit Rajbongshi, Kalpajit Hazarika “Characterization of Oil field Produced waters of Upper Assam Basin, India” International Journal of New Technologies in Science and Engineering Vol. 2, Issue. 1, 2015, Issn 2349-0780.
   7. Lee R., Seright R., Hightower M., Sattler A., Cather M., McPherson B., Wrotenbery L., Martin D., and Whitworth M.: “Strategies for Produced Water Handling in New Mexico,” paper presented at the 2002 Ground Water Protection Council.
   8. Arthur J. Daniel, Langhus Bruce G. and Patel Chirag “TECHNICAL SUMMARY OF OIL & GAS PRODUCED WATER TREATMENT TECHNOLOGIES” on March 2005
   9. Hardness in Drinking water, Background document for development of WHO guidelines for Drinking water quality.
   10. Kumar Manoj and Puri Avinash “A review of permissible limits of drinking water” at Indian Journal of Occupational and Environmental Medicine.