Lugo-Mercado, H. M., Badillo-Feliciano, J. and Ortiz-Alvarado, F. H. (1984) “Effects of no Tillage and Various Tillage Methods on Yields of Maize, Field Beans and Pepper Grown on a Mollisol in Southern Puerto Rico”, The Journal of Agriculture of the University of Puerto Rico, 68(4), pp. 349–354. doi: 10.46429/jaupr.v68i4.7303.