3.Frente Operária ano XXIX, no. 390 [Porta-voz do pensamento posadista no Brasil], (1981 October 7-20).

3.Frente Operária ano XXIX, no. 390 [Porta-voz do pensamento posadista no Brasil], (1981 October 7-20)., Box: 6. 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/372412 Accessed September 26, 2026.