K. M. de Araujo, D. C. C. de Oliveira, J. R. Rocha, J. A. Rocha, J. do N. Silva, and S. V. de Oliveira, “LAGOA DO PORTINHO IN PARNAÍBA, PIAUI, BRAZIL: EVALUATION OF THE INFRAESTRUCTURE AND TOURIST ATTRACTIONS”, REGET, vol. 18, no. 2, pp. 769–776, Aug. 2014.