Oorspronklik: Maria Callas - Volume 1 - Voices of the Opera Series. Sempre libera. Maria Callas. Voice sheet music. By Maria Callas. For Vocal.
Vertaling: Maria Callas - Deel 1 - Voices of the Opera Reeks. DIE Mona Lisa. Voice bladmusiek. Aria versamelings met vertolkings. Vir Vocal.