Badillo-Feliciano, J., R. Abrams, and R. Pietri. “Effect of Foliar-Applied Fertilizers on Pigeonpeas (Cajanus Cajan)”. The Journal of Agriculture of the University of Puerto Rico 61, no. 2 (April 1, 1977): 217–220. Accessed October 1, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/10461.