Leonard, M. D. “INSECT CONDITIONS IN PUERTO RICO DURING THE FISCAL YEAR, JULY 1, 1930 THRU JUNE 30, 1931”. The Journal of Agriculture of the University of Puerto Rico 16, no. 2 (April 1, 1932): 121–144. Accessed April 25, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/15037.