1. Alberta Energy, 2014. Oil Sands. Government of Alberta. http://www.energy.alberta.ca/OilSands/oilsands.asp.
2. American Petroleum Institute (API), 2009. Hydraulic Fracturing Operations—Well Construction and Integrity Guidelines. API GUIDANCE DOCUMENT HF1 FIRST EDITION.
3. Natural bitumen and extra-heavy oil, in 2007 Survey of Energy Resources;Attanasi,2007
4. The solar transformity of oil and petroleum natural gas;Bastianoni;Ecol. Model.,2005
5. The energy efficiency of oil sands extraction: energy return ratios from 1970 to 2010;Brandt;Energy,2013