Version 1 (Milan, 1904). (403 pp) G. Ricordi & C.: Milano – Roma – Napoli – Palermo – Parigi – Londra – Lipsia. New York: Boosey & Co. Buenos Aires: Breyer Hermanos. This version was withdrawn after the opening night. See Version History
Version 5, the "Standard Version". (266 pp) 1907 G. Ricordi & C.: New York – Milan – Rome – Naples – Palermo – London – Paris – Leipsig – Buenos Ayres – S. Paulo. See Version History
Di Cesare, Maria Carmela (1998). "Galli, Amintore". Dizionario Biografico degli Italiani [Biographical Dictionary of Italians] (in Italian). Vol. 51. Retrieved 5 January 2024.