1. Size distributions of the world’s largest known oil and tar accumulations;Roadifer,1987
2. Meyer RF, Attanasi ED, Freeman PA. Heavy oil and natural bitumen resources in geological basins of the world. US Geological Survey; 2007. Report No.: 2007-1084.
3. Energy Resources Conservation Board. Alberta’s energy reserves 2010 and supply/demand outlook 2011–2020. ST98-2011; 2011.
4. Central Intelligence Agency. The world factbook; 2011 January.
5. Rosenfeld J, Pont J, Law K, Hirshfeld D, Kolb J. Comparison of North American and imported crude oil lifecycle GHG emissions. Prepared for Alberta Energy Research Institute. TIAX Case # D5595; 2009 July.