The Art of the Verdi-Baritone by Carlo Galeffi, Mario Ancona, Enrico Molinari, Alexander Sved, Titta Ruffo, Pasquale Amato, Pavel Lisitsian, Giuseppe De Luca, Riccardo Stracciari, Heinrich Schlusnus, Joseph Schwarz, Lawrence Tibbett, Carlo Tagliabue, Leonard Warren, Mattia Battistini, Cesare Formichi, Giuseppe Danise, Victor Maurel, Antonio Scotti, Antonio Magini-Coletti & Elisa Petri