ECA: Estudios Centroamericanos 1984. New government ; Communiqués ; Speech by the President of the United Mexican States, Mr. Miguel de La Madrid, at the joint session of the United States Congress, held in that country. ECA: Estudios Centroamericanos. 39, 428 (Jun. 1984), 454–473. DOI:https://doi.org/10.51378/eca.v39i428.8786.