Fonte positiva dos dados

Verdi, Giuseppe. Rigoletto (Disco). [19--]: (barítono)

http://authorities.loc.gov/cgi-bin/Pwebrecon.cgi?AuthRecID=2595193&v1=1&HC=1&SEQ=20171009101051&PID=k91ax0nUpAsx_flUPLW8WON15: (Baritone)

http://catalogue.bnf.fr/ark:/12148/cb13990843g: (d.n. ; barítono ; italiano)