Calero, Reinaldo, Luis Muler Manzanares, and George E. Pringle. 1974. “Characteristic Indexes of the Household Level and Standard of Living of Agregado and Parcelero Families”. The Journal of Agriculture of the University of Puerto Rico 58 (2):170-83. https://doi.org/10.46429/jaupr.v58i2.10676.