1. Modern techniques of vocal rehabilitation for functional and organic dysphonias;Cooper,1971
2. Voice and articulation drillbook;Fairbanks,1960
3. An analysis of the voice and articulation abilities of the students registered in a required course in speech and dramatic art;Johnson,1938
4. An experimental study of the habitual and natural pitch levels of superior speakers;Pronovost,1939
5. An experimental study of methods for determining natural and habitual pitch;Pronovost;Speech Monographs,1942