https://projects.latimes.com/hollywood/star-walk/feodor-chaliapin/

https://www.opera.co.uk/features/ildar-abdrazakov/

https://www.fondazioneborischristoff.org/en/biography

https://www.metopera.org/discover/artists/baritone-and-bass/ferruccio-furlanetto/

https://masterworksbroadway.com/artist/ezio-pinza/

https://www.discogs.com/artist/842223-Nicolai-Ghiaurov

https://imgartists.com/roster/eric-owens/

https://www.facebook.com/ain.anger1/

https://www.operavivra.com/artists/basses/cesare-siepi/

https://www.salzburgerfestspiele.at/en/a/mika-kares

https://www.deezer.com/en/artist/240691