Lissenung Dive Resort, Kavieng, PNG, http://www.lissenung.com/

Coral Reef Alliance http://www.coralreefalliance.org/ 

Down Under Dive http://www.downunderdive.com.au/

The Dive Centre  http://www.divecentre.co.nz

Cape Verde Tropical Divers http://www.capeverdetropicaldivers.com/

Cave Divers Association of Australia (CDAA) http://www.cavedivers.com.au/

Dive Jobs http://www.diversjobs.com/

Dive 7 Seas http://www.dive7s.com

Dugong Dive Centre  http://www.dugongdivecentercom/

Technical Diving International http://www.tdisdi.com/tdi/courses/courses.html#AdvTrimix

World Underwater Confederation http://www.cmas2000.org/comtec/instr2/reginstr/edit.asp