Silva, E. M. N. C. de P.; Ferreira, R. L. F.; Ribeiro, A. M. A. de S.; Araújo Neto, S. E.; Kusdra, J. F. Agronomic Performance of Organic Lettuce Crop Influenced by Shading, Planting Times, and Tillage, in the State of Acre, Brazil. PAB 2015, 50, 468-474.