1. http://www.transcanada.com/keystone.html
2. http://www.nrdc.org/land/files/TarSandsPipeline4pgr.pdf
3. Energy Resources Conservation Board ST98–2011 Alberta's Energy Reserves 2010 and Supply/Demand Outlook 2011–2020 (ERCB, 2011).
4. BP Statistical Review of World Energy (BP, 2011); available at
http://www.bp.com/statisticalreview
.
5. Environment Canada National Inventory Report 1990–2009 (Environment Canada, 2011).