Oorspronklik: Rudiments of Music. Rudiments of Music. Cora B. Ahrens. Voice sheet music. Choir sheet music. Book 2. For Choral, Voice.
Vertaling: Beginsels van musiek. Voice bladmusiek. Koor bladmusiek. Beginsels van musiek. Boek 2. Saamgestel deur Cora B. Ahrens. Vir Choral, Voice.