A. R. ROEL, L. A. K. LEONEL, S. P. FAVARO, M. ZATARIM, C. M. V. MOMESSO, and M. V. SOARES, “EVALUATION OF ORGANIC FERTILIZERS ON CROP LETTUCE IN CAMPO GRANDE, MS”, SA, vol. 8, no. 3, pp. 325–329, Oct. 2007.