Silva, O.M. dos P., Negreiros, M.Z. de, Santos, E.C. dos, Lopes, W. de A.R., Lucena, R.R.M. de e Soares, A.M. 2017. Qualitative performance of lettuce cultivars in four seasons in Mossoró, Rio Grande do Norte State, Brazil. Revista Ceres. 63, 6 (fev. 2017).