Ramírez, C. T., Abruña, F., Lozano, J. and Vicente-Chandler, J. (1975) “Effect of Fertilization on Yields of Three Varieties of Rice at Two Locations in Puerto Rico”, The Journal of Agriculture of the University of Puerto Rico, 59(1), pp. 1–4. doi: 10.46429/jaupr.v59i1.10623.