Puerto Rico Department of Labor, Migration Division. "A Summary of Facts & Figures: 1. Progress in Puerto Rico, 2. Puerto Rican Migration" edition, 1959 January

Puerto Rico Department of Labor, Migration Division. "A Summary of Facts & Figures: 1. Progress in Puerto Rico, 2. Puerto Rican Migration" edition, 1959 January, Box: 192, Folder: 14. Julian Samora Papers, 24426265. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/389648 Accessed September 27, 2026.