Camoens, J. K., R. E. McDowell, L. D. VanVleck, and J. D. Rivera Anaya. “Holsteins in Puerto Rico: II. Influence of Lactation Length, Days Dry, Days Open, and Calving Interval on Production Traits”. The Journal of Agriculture of the University of Puerto Rico 60, no. 4 (October 1, 1976): 540–550. Accessed April 19, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10499.