Yazman, J. A., Velez-Santiago, J., Arroyo-Aguilu, J. A. and McDowell, R. E. (1983) “Evaluation of Five Tropical Grasses for Growing Holstein Heifers”, The Journal of Agriculture of the University of Puerto Rico, 67(2), pp. 79–94. doi: 10.46429/jaupr.v67i2.7696.