Signature: Lower left corner signed in pen and brown ink: "Ferrario C."
Inscription: On the mount in printed letters along center of upper border: "Opera di Roberto il Daivolo. Inedito"; along center of lower border: "Ferrario C."
Vendor: Randolph Gunter (American, died 1962)
David J. Hough "Ferrario, Carlo: Bibliography." in The New Grove Dictionary of Music Online. Edited by L. Macy, August 9, 2002.