Tourism, ecotourism, and protected areas: the state of nature-based tourism around the world and guidelines for de development - Ceballos-Lascuráin, Héctor (Gland : IUCN, 1996)
Keywords: ECOTURISMOS-CONGRESOS; RECURSOS NATURALES-CONSERVACION; TURISMO-ASPECTOS AMBIENTALES-CONGRESOS; AREAS NATURALES-CONGRESOS