Titta, Ruffo Cafiero (Titta Ruffo)

Ruffo, Titta(1877–1953)

Muzička enciklopedija

Ruffo, Titta(1877–1953)

Großes Sängerlexikon

Ruffo, Titta(1877–1953)

Encyclopedia of recorded sound

Ruffo, Titta(1877–1953)

The Paris Opéra: An encyclopedia of operas, ballets, composers, and performers

Ruffo, Titta(1877–1953)

DEUMM Online

Ruffo, Titta(1877–1953)

MGG Online

kurt malisch