Danforth, Stuart T., and J. Adger Smyth. “THE PUERTO RICAN FORM OF THE BROAD-WINGED HAWK”. The Journal of Agriculture of the University of Puerto Rico 19, no. 4 (October 1, 1935): 485–486. Accessed April 23, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/14282.