1. Bergner P. (2016). “ Income inequality and natural resources .” https://lup.lub.lu.se/student-papers/search/publication/8890838
2. Daly, H. E., & Farley, J. (2011). Ecological economics: Principles and applications (2nd ed). Island Press.
3. Unit Roots in Time Series Models: Tests and Implications
4. Dudley B. (2018). BP statistical review of world energy 2018 . Energy economic Centre for energy economics research and policy. British Petroleum. Available via https://www.bp.com/en/global/corporate/energy-economics/statistical-reviewof-world-energy/electricity.html5
5. Oil exploration and poverty in the Niger Delta Region of Nigeria: A critical analysis;Ebegbulem J. C.;International Journal of Business & Social Science,2013