Vázquez, R. (1965) “Effects of Irrigation and Nitrogen Levels on the Yields of Guinea Grass, Para Grass, and Guinea Grass-Kudzu and Para Grass-Kudzu Mixtures in Lajas Valley”, The Journal of Agriculture of the University of Puerto Rico, 49(4), pp. 389–412. doi: 10.46429/jaupr.v49i4.13040.