1. Bonakdarpour, M. & Larson, J.W. (2012). The Economic and Employment Contributions of Unconventional Gas Development in State Economies. IHS.
2. Boyer, Ch. et al (2011). Shale gas: A global resource. Oilfield Review, Autumn 2011, 28-39.
3. Gény, F. (2010). Can Unconventional Gas be a Game Changer in European Gas Market? Oxford Institute for Energy Studies.
4. Holditch, S.A. & Madani, H.A.D. (2010). Global Unconventional Gas - It Is There, But Is It Profitable? JPT Online.
5. Holditch, S.A. et al. (2007). Unconventional Gas. Working Document of the NPC Global Oil & Gas Study. Topic Paper #29.