- https://www.propublica.org/article/natural-gas-politics-526
- https://www.claimsjournal.com/news/national/2014/07/11/251654.htm
- https://www.dispatch.com/content/stories/local/2013/08/01/fracking-lobby-helps-fund-gop-campaigns.html
- https://thinkprogress.org/climate/2014/05/30/3443332/california-fracking-ban-fails/
- https://www.taxpayer.net/images/uploads/downloads/Political_Footprint_of_the_Oil_and_Gas_Industry_Lobby_April_2014_FINAL.docx.pdf
- https://www.commoncause.org/new-york/research-and-reports/NY_040711_Report_Natural_Gas_Lobbying_Expenditures.pdf
- https://www.commoncause.org/new-york/research-and-reports/NY_010912_Report_Deep_Drilling_Deep_Pockets_Campaign_Contributions.pdf
- https://www.polluterwatch.org/blog/big-oil-front-group-poured-millions-lobby-against-fracking-regulation