Azevedo, Alcinei Mistico, et al. “Genetic Parameters and Path Analysis for Early Flowering and Agronomic Traits of Lettuce”. Pesquisa Agropecuaria Brasileira, vol. 49, no. 2, May 2014, pp. 118-24, doi:10.1590/S1678-3921.pab2014.v49.18540.