Dohanian, S. M. “THE IMPORTATION OF COCCINELLID ENEMIES OF DIASPINE SCALES INTO PUERTO RICO”. The Journal of Agriculture of the University of Puerto Rico 21, no. 2 (April 1, 1937): 243–247. Accessed November 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/14339.