2. "Denuncia: Ditadura comprou Chapa 4."Companheiro Ano 2, no. 43, (1980 December 3-16).

2. "Denuncia: Ditadura comprou Chapa 4."Companheiro Ano 2, no. 43, (1980 December 3-16)., Box: 23. 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/375110 Accessed September 26, 2026.