Bèlza, Igor' Fëdorovič

Belza, Igor Fjodorovič(*1904)

Muzička enciklopedija

BELZA, Igor Fjodorovitsj(*1904)

Algemene muziek encyclopedie

Belza, Igor’ Fëdorovič(1904–1994)

DEUMM Online

Belza, Igor' Fyodorovich(*1904)

Biographical dictionary of Russian/Soviet composers