Silva , J., A. Souza Junior, S. Bordallo, R. Muller, E. Souza, and I. Barbosa. “Physical-Chemical and Chemical Analysis of Groundwater of Monsarás and Condeixa Communities, Salvaterra-PA”. ITEGAM-JETIA, Vol. 3, no. 9, Mar. 2017, http://br940.teste.website/~itegamjetia/journal/index.php/jetia/article/view/130.