Reid, C. L. (2018). The free voice: A guide to natural singing (50th anniversary edition.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Reid, Cornelius L. The Free Voice: A Guide to Natural Singing. 50th anniversary edition. New York, NY: Oxford University Press, 2018.
Lua MLA (9ú heag.)Reid, Cornelius L. The Free Voice: A Guide to Natural Singing. 50th anniversary edition. Oxford University Press, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.