4. Barbalho da Silva, Fernando Roberto, Secretario Sindical. PT/Ba. "Programa de constituição da Secretaria Sindical." N.p.:, 1987 November.

4. Barbalho da Silva, Fernando Roberto, Secretario Sindical. PT/Ba. "Programa de constituição da Secretaria Sindical." N.p.:, 1987 November., Box: 17. 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/373972 Accessed September 26, 2026.