Jorge Duarte. Billy no seas un héroe (Murray - Gallander - Okamura), Ante el mundo (Rodolfo Hernandez R.) (Unknown Location: Lado A.), undated

Jorge Duarte. Billy no seas un héroe (Murray - Gallander - Okamura), Ante el mundo (Rodolfo Hernandez R.) (Unknown Location: Lado A.), undated, Item: 256. Rio Record Shop Collection, 24006037. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/472861 Accessed September 27, 2026.