León, C. J. (1997). Valuing international tourism benefits from natural areas. Tourism Economics, v. 3 (2), p. 119-136. https://doi.org/10.1177/135481669700300202
León, C. J. (1997). Valuing international tourism benefits from natural areas. Tourism Economics, v. 3 (2), p. 119-136. https://doi.org/10.1177/135481669700300202