2. "Trabalhador, tome partido da sua classe. Valdisio, Vereador PT." N.p.:, undated

2. "Trabalhador, tome partido da sua classe. Valdisio, Vereador PT." N.p.:, undated, Box: 16. 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/373788 Accessed September 26, 2026.