| appea.com.au | Australian Petroleum Production and Exploration Association |
| aip.com.au | Australian Institute of Petroleum |
| caplacanada.org | Canadian Association of Professional Land Administration |
| caftha.ca | Canadian Federation of Trading Houses Associations CAFTHA |
| acec.ca | Canada Consulting Engineers |
| cppi.ca | Canadian Petroleum Products Institute Cppi / Icpp |
| canadiangaspotential.com | Canadian Gas Potential Committee |
| arab-oil-gas.com | Arab Petroleum Research Center |
| apia.net.au | Australian Pipeline Industry Association (APIA) |
| afgaz.fr | AFG ( Association Française du Gaz ) |
28251
, ,