Chadbourne, Norma Jean Erdmann. Singer's manual / [electronic resource] / Norma Chadbourne, E.T.A. Chadbourne.. — Boston : : Stanley Society,, [c1950-. — v. : : ill. ; 23 cm.
Imprint varies: pt. 2-4, White Plains, N.Y., Chadbourne Conservatory of Vocal Arts.
pt. 1. First principles.--pt. 2. Preparatory stage.--pt. 3. Breath-pressure.--pt. 4. Inspiratory tension.