Enlaces:
[1] http://wdfw.wa.gov/wlm/tourism
[2] http://www.monografias.com/trabajos37/turismo-naturaleza/turismo-naturaleza.shtml
[3] http://www.responsibletourismpartnership.org/publications/changing%20the%20na%85%20of%20tourism.pdf
[4] http://www.elaw.org/assets/pdf/Economic.perspectives.tourism.pdf
[5] http://www.iucn.org/places/medoffice/Documentos/seminario_azahar_04.pdf
[6] http://www.mrsc.org/Subjects/Econ/ed-TourEco.aspx
[7] http://www.unep.org/ourplanet/imgversn/101/otte.html
[8] http://landscaperesearch.livingreviews.org/Articles/lrlr-2007-2/
[9] http://www.oas.org/tourism/docnet/iatc3en.htm
[10] http://www.fs.fed.us/pnw/pubs/gtr506.pdf
[11] http://www.monografias.com/trabajos34/turismo-de-naturaleza/turismo-de-naturaleza.shtml
[12] http://www.conafor.gob.mx/portal/index.php?l1=13&l2=1
[13] http://colegiodeagronomos.com/learn/educacion/ecoturismo.pdf
[14] http://www.coalicionventanasverraco.org/