American Petroleum Institute#www.api.org
European Energy Network#www.eva.wsr.ac.at
Cambridge Energy Research Associates#www.cera.com
Canadian Research Institute#www.ceri.ca
Center for Global Energy Studies#www.cges.co.uk
United States Energy Information Administration#www.eia.doe.gov
ESAI#www.esai.com
Gustavson#www.gustavson.com
Institute of Gas Technology#www.igt.org
Institute of Petroleum#www.petroleum.co.uk
International Centre for Gas Technology Information #www.gtionline.org
international energy agency#www.iea.org
OPEC#www.opec.org
Oxford Institute of Energy Studies#www.associnst.ox.ac.uk
Petroleum Association Of Japan#www.paj.gr.jp
Petroleum Equipment Institute#www.peinet.org
PIRA#www.pira.com
Verginia University#www.virginia.edu
Organization of Economic Development Europe#www.oced.org
Aberdeen Formation Evaluation Society#www.afes.org.uk
Brent Friedenberg Association#www.bfa.com
Texas A & M University#www.pumpjack.tamu.edu
Energyasia#www.energyasia.com
University of Dundee#www.dundee.ac.uk
