Robinson, J. Gregory. "Preliminary Review of Existing Studies of the Number of Illegal Residents in teh United States." U.S. Bureau of the Census, 1980 January

Robinson, J. Gregory. "Preliminary Review of Existing Studies of the Number of Illegal Residents in teh United States." U.S. Bureau of the Census, 1980 January, Box: 194, Folder: 7. Julian Samora Papers, 24426265. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/389692 Accessed September 27, 2026.