1. Guide 9 – Casing Cementing;AER (Alberta Energy Regulator),1999
2. Reducing Methane Emissions;Alberta Government,2015
3. Possible indicators of leakage along wells;Bachu,2006
4. Fugitive emissions of methane from abandoned, decommissioned oil and gas wells;Boothroyd;Sci. Total Env.,2016
5. Greenhouse Gas (GHG) Emissions;Conference Board of Canada,2011