1. Johnstone B. Bakken black gold. Leader-Poster, 2007-12-10(6).
2. Worldwide tight oil and its current exploration & development conditions;Zhang;Oil Forum,2013
3. The status and impact of tight oil in North America;Hou;International Petroleum Economics,2013
4. BP statistical review of world energy 2011;British Petroleum Company,2011
5. Energy briefing note, tight oil developments in the western Canadian Sedimentary Basin;National Energy Board,2011