1S.K.Gupta.Technological innovations in major world oil crops,Volume 1.Breeding[M].2012,ISBN.1461403553.
2S.K.Gupta.Technological innovations in major world oil crops,Volume 2.Perspectives[M].2011,ISBN.1461408261.
3Exxonmobil.Summary Annual Report 2013.
4BP,BP_Annual Report and Form 20F 2013.
5Shell.Royal Dutch Shell plc Annual Report and Form 20-F for the year ended December 31,2013.
6Total.Doing Business Responsibly.CSR Report 2013.
7Shell.Royal Dutch Shell plc Annual Report and Form 20-F for the year ended December31,2013.
8Ernst & Young. Global oil and gas transactions review 2011[R].Antimicrobial Agents and Chemotherapy,2009,(7).doi:10.1128/AAC.00018-09.
9IHS Global Insight. The economic contribution of the onshore independent and natural gas producers to the U.S[R].Independent Petroleum Association of America,2009.doi:10.1016/j.cancergencyto.2009.08.001.