Original tekst: Agnes von Hohenstaufen - 1. Composed by Gaspare Spontini. Halbband. Agnes von Hohenstaufen - 1. Halbband. Hardcover.
Oversættelse: Komponeret af Gaspare Spontini. Operaen, Masterpieces of Operatic Historie, bind 6 Clothbound. Redigeret af Jens Wildgruber.