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Paolo Guetta: _Il Canto nel suo Mecanismo_. Milan, 1902.

Lilli Lehmann: _Meine Gesangskunst_. Berlin, 1902.

David Frangcon-Davies: _The Singing of the Future_. London, 1906.

Leo Kofler: _The Old Italian Method_. Albany, 1880.

_The Art of Breathing_. New York, 1889.

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Charles Lunn: _The Philosophy of the Voice_. London, 1878.

Antoine Ferrein: _De la Formation de la Voix de l'Homme_. Paris, 1741.

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Carl Ludwig Merkel: _Der Kehlkopf_. Leipzig, 1873.

Dr. L. Mandl: _Die Gesundheitslehre der Stimme_. Braunschweig, 1876.

George F. Ladd: _Outlines of Physiological Psychology_. New York, 1892.

James M. Baldwin: _Feeling and Will_. New York, 1894.

H. S. Curtis: "Automatic Movements of the Larynx