1. Intergovernmental Panel on Climate Change (IPCC). FifthAssessment Report, Workgroup I, Chapter 8, Intergovernmental Panelon Climate Change, Geneva, (2014.
2. Intergovernmental Panel on Climate Change (IPCC). FifthAssessment Report, Workgroup III, Chapter 5, Intergovernmental Panelon Climate Change, Geneva, (2014.
3. U.S. Environmental Protection Agency. Inventory of U.S.Greenhouse Gas Emissions and Sinks: 1990–2013, EPA 430-R-14-003,April (2015.
4. Measurements of methane emissions at natural gas production sites in the United States
5. Methane Emissions from Process Equipment at Natural Gas Production Sites in the United States: Pneumatic Controllers