1. Treatise on vocal performance and ornamentation;Hiller;Early Music,2001
2. Baroque corner: introduction to Baroque vocal ornamentation;Hawn;NATS,1986
3. Vocal ornamentation in the sacred music of the Schuetz era;Buelow;Am Choral Rev,1982
4. The Vibrato;Seashore,1932
5. Laryngeal adduction in trillo;Brown;J Voice,1992