| pmaa.org | Petroleum Marketers Association of America |
| pei.org | Petroleum Equipment Institute |
| opcaonline.org | Ontario Petroleum Contractors Association |
| canadiangaspotential.com | Canadian Gas Potential Committee |
| spee.org | Society of Petroleum Evaluation Engineers |
| pica.net.au | Petroleum Industry Contractors Association (Australia) |
| arab-oil-gas.com | Arab Petroleum Research Center |
| appea.com.au | Australian Petroleum Production and Exploration Association |
| apia.net.au | Australian Pipeline Industry Association (APIA) |
| aip.com.au | Australian Institute of Petroleum |
| go2net.com | search.go2net.com/ |
United States , Arizona , Scottsdale