Zapata, Mildred, Robert Wilkinson, George F. Freytag, Hiram Vélez, Francisco H. Ortiz, and Julio H. López-Rosa. “Incorporating Resistance to Xanthomonas Campestris Pv, Phaseoli into Bean Using the Latent Period As a Resistance Marker”. The Journal of Agriculture of the University of Puerto Rico 75, no. 4 (October 1, 1991): 345–352. Accessed December 7, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/3620.