Oxford History of Western Music: 5-vol. set
Richard Taruskin
Angelo Solerti, in Le origini del melodrama: Testimonianze dei contemporanei ( Turin: Fratelli Bocca, 1903), p. 56, trans. Piero Weiss in Piero Weiss and Richard Taruskin, Music in the Western World: A History in Documents, 2nd ed., p. 143.