4. Oto. "Traço de união.", 1981 December. ["Conf. Reg. São Paulo, (Esquerda-VI Congresso) 1981 October."]

4. Oto. "Traço de união.", 1981 December. ["Conf. Reg. São Paulo, (Esquerda-VI Congresso) 1981 October."], Box: 3. Eduardo Sarno Collection of Leftist Movements in Brazil, 2002-03. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/371735 Accessed September 27, 2026.