Charles Philip Sonnichsen, "Ramón Rivera Rodríguez: The Music of a Chicano Prisoner" (M.A. thesis, University of California at Los Angeles), 1972

Charles Philip Sonnichsen, "Ramón Rivera Rodríguez: The Music of a Chicano Prisoner" (M.A. thesis, University of California at Los Angeles), 1972, Box: 133, Reel: 1. Américo Paredes Papers, 51244413. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/458553 Accessed September 25, 2026.