Gutiérrez D., J., W. Cardona, and O. Monsalve C. “Potential for the Use of Chemical Properties As Indicators of Soil Quality. A Review”. Revista Colombiana De Ciencias Hortícolas, Vol. 11, no. 2, Jan. 2018, pp. 450-8, doi:10.17584/rcch.2017v11i2.5719.