The Art of Singing. (Trans. by Dr. F. Seeger). New York, 1872.

Stéphen de la Madelaine: Théorie complète du Chant. Paris, 1852.

Lennox Browne and Emil Behnke: Voice, Song, and Speech. London, 1883.

John Howard: The Physiology of Artistic Singing. New York, 1886.

Gordon Holmes: A Treatise on Vocal Physiology and Hygiene. London, 1879.

Emma Seiler: The Voice in Singing. Philadelphia, 1886.

J. Frank Botume: Modern Singing Methods. Boston, 1885.

Francesco Lamperti: A Treatise on the Art of Singing. (Trans. by J. C. Griffith). New York. Original about 1876.

Wesley Mills, M. D.: Voice Production in Singing and Speaking. Philadelphia, 1906.