1. Global Energy: Challenges and Solutions in an Upstream and Downstream Oil and Gao Operation:
http://globalenergy.pr.co/65678-challenges-and-solutions-in-an-upstream-and-downstream-oil-and-gas-operation
. Retrieved 6 Aug 2016
2. Wikepedia: Midstream.
https://en.wikipedia.org/wiki/Midstream
. Retrieved 6 Aug 2016
3. Wikipedia:
https://www.bts.gov/content/us-oil-and-gas-pipeline-mileage
. Retrieved 8 Oct 2018
4. http://www.pipeline101.org/where-are-pipelines-located
. Retrieved 8 Oct 2018
5. Retrieved November 8, 2016