Bruno, R.S. "O 'modo de abordagem' do trabalho de massa." N.p.:, 1980 September.

Bruno, R.S. "O 'modo de abordagem' do trabalho de massa." N.p.:, 1980 September., Box: 2, Folder: 6. 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/370447 Accessed September 26, 2026.