3. Bruno. "Os principios da prática." N.p.:, August 1981.

3. Bruno. "Os principios da prática." N.p.:, August 1981., Box: 2. 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/371509 Accessed September 26, 2026.