3.Correio Sindical de Unidade ano III, no. 17, (1980 November).

3.Correio Sindical de Unidade ano III, no. 17, (1980 November)., Box: 25. 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/375778 Accessed September 26, 2026.