Estrada, Leobardo F, Gilbert Cardenas, and L. Manuel Garcia y Griego. "Measuring the Volume and Social Impact of Undocumented Immigration: Confusions Leading to Unfounded Exaggerations." N.p., undated

Estrada, Leobardo F, Gilbert Cardenas, and L. Manuel Garcia y Griego. "Measuring the Volume and Social Impact of Undocumented Immigration: Confusions Leading to Unfounded Exaggerations." N.p., undated, Box: 168, Folder: 9. Julian Samora Papers, 24426265. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/388973 Accessed September 27, 2026.