Mangual Crespo, G. et al. 1987. Nitrogen levels and Rhizobium inoculation and yields of native white bean (Phaseolus vulgaris L.). The Journal of Agriculture of the University of Puerto Rico. 71, 1 (Jan. 1987), 1–6. DOI:https://doi.org/10.46429/jaupr.v71i1.6918.