1. O. de B. Z. "Breve história do Partido." N.p.:, 1981 February.

1. O. de B. Z. "Breve história do Partido." N.p.:, 1981 February., Box: 14. 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/373613 Accessed September 26, 2026.