Willis, Edwin O. “BEHAVIORAL NOTES, BREEDING RECORDS, AND RANGE EXTENSIONS POR COLOMBIAN BIRDS”. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales 16, no. 63 (December 31, 1988): 137–150. Accessed June 18, 2026. https://raccefyn.co/index.php/raccefyn/article/view/3707.