1. Adamu, A., Yacob, M.R., Radam, A., & Hashim, R. (2015). Factors determining visitors’ willingness to pay for conservation in Yankari Game Reserve, Bauchi, Nigeria. International Journal of Economics and Management, 9(S), 95-114.
2. Valuing irrigation water using survey-based methods in the Tungabhadra River Basin.;D. N.Barton;India Irrigation and Drainage Systems,2010
3. Status of wetlands in India: A review of extent, ecosystem benefits, threats and management strategies.;N.Bassi;Journal of Hydrology: Regional Studies,2014
4. BatemanI. J.CarsonR. T.DayB.HannemanM.HanleyN.HettT.MouratoS. (2002). Economic Valuation with Stated Preference Techniques: A Manual. Cheltenham, UK: Edward Elgar.
5. Public policies for managing urban growth and protecting open space: Policy instruments and lessons learned in the United States.;D. M.Bengston;Landscape and Urban Planning,2004