1. Pantoja. [Ptj?] "O Movimiento operário em Belém." N.p.:, 1981 February. ["I Conf. Reg.-PA."]

1. Pantoja. [Ptj?] "O Movimiento operário em Belém." N.p.:, 1981 February. ["I Conf. Reg.-PA."], Box: 8. 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/372555 Accessed September 26, 2026.