4. "Metalúrgicos do Rio: Aliança de Golbery, Chagas, Sílvio e do Hora do Povo."Movimento, (1980 December 4).

4. "Metalúrgicos do Rio: Aliança de Golbery, Chagas, Sílvio e do Hora do Povo."Movimento, (1980 December 4)., Box: 23. 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/375112 Accessed September 26, 2026.