Román-García, F., McDowell, R. E., Cestero, H., Rivera-Anaya, J. D., & Arroyo-Aguilú, J. A. (1979). Performance of Holstein Cows Born in Puerto Rico Versus Cows Imported from the United States. The Journal of Agriculture of the University of Puerto Rico, 63(1), 13–21. https://doi.org/10.46429/jaupr.v63i1.10303