Camoens, J. K., R. E. McDowell, L. D. Van Vleck, and J. D. Rivera Anaya. “Holsteins in Puerto Rico: I. Influence of Herd, Year, Age, and Season on Performance”. The Journal of Agriculture of the University of Puerto Rico 60, no. 4 (October 1, 1976): 526–539. Accessed March 28, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10498.