1. Aayog N. Draft National Energy Policy, Government of India, New Delhi.
2. Underground coal gasification a future source of energy security;Mathur,2010
3. C.S. Office. Energy Statistics 2018, Ministry of Statistics and Programme Implementation, Government of India, New Delhi; 2018. pp. 1–110.
4. Report of the expert committee;Policy,2006
5. M. of Mines, Coal & Lignite, Indian Minerals Yearbook – 2017, Government of India, Indian Bureau of Mines, Nagpur.