Gordon Holmes: A Treatise on Vocal Physiology and Hygiene (1879).
John Howard: The Physiology of Artistic Singing (1886).
Dora Jones: Lyric Diction (New York, 1913).
Kickson and Neal: English Folk-song and Dance (Cambridge, Eng., 1905).
H. E. Krehbiel: Afro-American Folk-song (New York, 1914).
Louis Lablache: Complete Method of Singing.
Francesco Lamperti: A Treatise on the Art of Singing (Trans. by J. C. Griffiths, 1876).
Lilli Lehmann: How to Sing (New York, 1912).
Eugenie Lineva: Peasant Songs of Great Russia (Engl. and Russian text, Imperial Academy of Science, St. Petersburg).
Sir Morell Mackenzie: The Hygiene of the Vocal Organs (London, 1890).