Unander, D. W., L. N. Avilés-Rodríguez, F. Varela-Ramírez, and A. Acosta. “Plant Population and Pruning of Pepper Cultivars”. The Journal of Agriculture of the University of Puerto Rico, vol. 75, no. 3, July 1991, pp. 199-04, doi:10.46429/jaupr.v75i3.3587.