2. "Roberto Ribeiro Martins: Deputado Federal [Conheça Cuba e colabore com a campanha do PT. No. 675, CR$500,00]." Salvador:, 1990 July 1.

2. "Roberto Ribeiro Martins: Deputado Federal [Conheça Cuba e colabore com a campanha do PT. No. 675, CR$500,00]." Salvador:, 1990 July 1., Box: 12. 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/373347 Accessed September 26, 2026.