Reid, C. L. (2018). The free voice: A guide to natural singing (50th anniversary edition.). Oxford University Press.
Chicago-viite (17. p.)Reid, Cornelius L. The Free Voice: A Guide to Natural Singing. 50th anniversary edition. New York, NY: Oxford University Press, 2018.
MLA-viite (9. p.)Reid, Cornelius L. The Free Voice: A Guide to Natural Singing. 50th anniversary edition. Oxford University Press, 2018.
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