10. "Alguns problemas de ordem filosófica a serem analisados." N.p.:, 1989 April.

10. "Alguns problemas de ordem filosófica a serem analisados." N.p.:, 1989 April., Box: 11. 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/373175 Accessed September 26, 2026.