"Las Preferencias arancelarias de Estados Unidos a América Latina y las negociaciones multilaterales,"Comercio exterior 23 (8), August 1973

"Las Preferencias arancelarias de Estados Unidos a América Latina y las negociaciones multilaterales,"Comercio exterior 23 (8), August 1973, Box: 15, Folder: 11. Guy F. Erb Records of the Mexico-U.S. Business Committee and Related Materials, 2004-54. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/450425 Accessed September 25, 2026.