González-Chapel, A., and M. Rojas Daporta. “Influence of Time of Hatching on Sexual Maturity of Pullets in Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 35, no. 3 (July 1, 1951): 100–113. Accessed March 28, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12808.