Rodríguez, S. J. and Cibes, H. R. (1977) “Effect of Five Levels of Nitrogen at Six Shade Intensities on Growth and Leaf-Nutrient Composition of Dracaena deremensis ’Warneckii,’ Engler”., The Journal of Agriculture of the University of Puerto Rico, 61(3), pp. 305–313. doi: 10.46429/jaupr.v61i3.10428.