Barrera, Mario. "Colonial Labor and Theories of Inequality: The Case of International Harvester." N.p., undated

Barrera, Mario. "Colonial Labor and Theories of Inequality: The Case of International Harvester." N.p., undated, Box: 154, 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/388642 Accessed September 26, 2026.