Silva, Maria José Silveira da, et al. “PHYSIO-CHEMICAL EVALUATION AND MICROBIOLOGICAL OF THE UNDERGROUND WATER IN TWO COMMUNITIES OF CATOLÉ DO ROCHA-PB”. Revista Verde De Agroecologia E Desenvolvimento Sustentável, vol. 4, no. 4, Nov. 2009, pp. 115-21, https://www.gvaa.com.br/revista/index.php/RVADS/article/view/225.