Cleall, C. (1955). Voice production in choral technique. Novello & Co..
Cita Chicago (17th ed.)Cleall, Charles. Voice Production in Choral Technique. London: Novello & Co., 1955.
Cita MLA (8th ed.)Cleall, Charles. Voice Production in Choral Technique. Novello & Co., 1955.
Atenció: Aquestes cites poden no estar 100% correctes.