Parra-González, Sergio David, and Jeisson Rodriguez-Valenzuela. 2017. “Determination of the Soil Quality Index by Principal Component Analysis in Cocoa Agroforestry System in the Orinoco Region, Colombia”. Journal of Agriculture and Ecology Research International 10 (3), 1-8. https://doi.org/10.9734/JAERI/2017/31346.