1. National Academy of Sciences (2012) Induced Seismicity Potential in Energy Technologies.
https://www.nap.edu/resource/13355/Induced-Seismicity-Report-Brief-Final.pdf
2. King GE (2012) Hydraulic fracturing 101: what every representative, environmentalist, regulator, reporter, investor, university researcher, neighbor and engineer should know about estimating frac risk and improving frac performance in unconventional gas and oil. In: SPE 152596, SPE hydraulic fracturing technology conference
3. California Council on Science and Technology (2016) Advanced well stimulation technologies in California: an independent review of scientific and technical information, July 2016.
https://ccst.us/wp-content/uploads/160708-blm-report.pdf
4. Colorado Oil & Gas Conservation Commission (2011) Frequently asked questions about hydraulic fracturing.
https://cogcc.state.co.us/Announcements/Hot_Topics/Hydraulic_Fracturing/Frequent_Questions_about_Hydraulic%20Fracturing.pdf
5. U.S. Energy Information Administration (2018) Petroleum and other liquids data.
https://www.eia.gov/petroleum/data.php#crude