Gupta, Sumeet, and Rakesh Kumar Sharma. “Pricing and Taxation in Oil and Gas Sector: A Study With Special Reference to ONGC”. Journal of Global Economy 8, no. 3 (October 8, 2012): 233-260. Accessed September 22, 2019. http://www.rcssindia.org/jge/index.php/jge/article/view/220.