Coward, H. (2007). Choral technique and interpretation. Read Books.
Lua i Stíl Chicago (17ú heag.)Coward, Henry. Choral Technique and Interpretation. Alcester: Read Books, 2007.
Lua MLA (9ú heag.)Coward, Henry. Choral Technique and Interpretation. Read Books, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.