1. California Council on Science and Technology （2018） “Orphan Wells in California: An Initial Assessment of the State’s Potential Liabilities to Plug and Decommission Orphan Oil and Gas Wells”, P3, https://ccst.us/wp-content/uploads/CCST-Orphan-Wells-in-California-An-Initial-Assessment.pdf
2. Kang Mary et al （2016） “Identification and characterization of high methane-emitting abandoned oil and gas wells", Proceedings of the National Academy of Sciences. 113 （48）: 13636–13641. doi:10.1073/pnas.1605913113
3. Kang Mary et al （2021） “Orphaned oil and gas well stimulus—Maximizing economic and environmental benefits”, Elementa: Science of the Anthropocene （2021） 9 （1）: 00161. doi.org/10.1525/elementa.2020.20.00161
4. USGS （2023） “Analysis of the United States Documented Unplugged Orphaned Oil and Gas Well Dataset”, P1, doi.org/10.3133/dr1167 https://pubs.usgs.gov/publication/dr1167/full#:~:text=Based%20on%20information%20from%20most,all%20states%20is%20probably%20higher, 2023年9月21日閲覧．
5. 3KRTV （2020） “August 19, 2020 Well Done Foundation sets out to cut emissions from abandoned wells”, https://www.krtv.com/news/montana-and-regional-news/well-done-foundation-sets-out-to-cut-emissions-from-abandoned-wells, 2023年9月21日閲覧．