- Costa Rican Association for Communal Rural Tourism (Actuar) www.actuarcostarica.com
- Latin American Centers and Programs for a Cleaner Production www.cp-latin-unido.net
- Central American Environmental and Development Commission (CCAD) http://www.ccad.ws
- Commission for Environmental Cooperation www.cec.org
- World Business Council for Sustainable Development (WBCSD) www.wbcsd.org
- Danish Environmental Protection Agency www.mst.dk/English
- Costa Rica Climate Change National Strategy www.encc.go.cr
- Holcim (Costa Rica), S.A. www.holcim.com/CR
- Geocycle Environmental Services S.A.G. S.A., members of Holcim Group www.geocycle.co.cr
- Ideas to Save the Planet (El País y La Nación) www.nacion.com/multimedia/2008/enero/consejos
- Ideas for a better world www.ideasxunmundomejor.com
- Costa Rican Industrial Waste and Waste Byproduct Market (MERSI)
http://www.borsi.org/html/principal.asp?Bolsa=6
- Swedish Environmental Protection Agency www.naturvardsverket.se
- US Environmental Protection Agency www.epa.gov
