Onweremadu, E. U., Okoli, I. C., Emenalom, O. O., Opara, M. N. e Eshett, E. T. (2006) “SOIL QUALITY EVALUATION IN RANGELAND SOILS IN RELATION TO HEAVY METALS POLLUTION”, Estudos de Biologia, 28(63). doi: 10.7213/reb.v28i63.22722.