Camacho Cardoso, Osvaldo Daniel Martínez, and José R. Fábrega D. “Valuation of Natural Resources and Performance Indicators, Fundamental Support for Creation of a Systemic Financial Model for Watersheds”. RA Journal Of Applied Research, vol. 4, no. 12, Dec. 2018, pp. 2126-33, doi:10.31142/rajar/v4i12.01.