3. Negão and Chico. "Carta de Negão e Chico sobre a V C.N." [A: CR do PC do B (esquerda) no Pará]. N.p.:, 1982 May.

3. Negão and Chico. "Carta de Negão e Chico sobre a V C.N." [A: CR do PC do B (esquerda) no Pará]. N.p.:, 1982 May., 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/373540 Accessed September 26, 2026.