1. Geology and resources of some world oil-shale deposits;Dyni,2003
2. Oil shale development in china;Qian;Oil Shale,2003
3. Economic evaluation, recovery techniques and environmental implications of the oil shale deposit in the Abakaliki Anticlinorium, southeastern Nigeria;Ehinola;Oil Shale,2005
4. Petroleum formation and occurrence;Tissot,1984
5. Unconventional oil and gas resource development – Let’s do it right;Holditch;Unconv Oil Gas Resour,2013