Original: Album No. 1. Astor Piazzolla. Album No. 1 composed by Astor Piazzolla. La muerte del angel. Balada Para Un Loco.
Translation: Classical Guitar sheet music. 1921-1992. Edited by Ruiz. For guitar. Published by Ediciones Musicales Melos. QM.MEL-4032. Verano Porteno.