1. Pitch perturbation as a function of subjective vocal constriction;Beckett;Folia Phoniatr. (Basel),1969
2. A normative study of air flow in children;Beckett;Br. J. Disord. Commun.,1971
3. Maximum phonation time, air flow rate, and air volume during phonation: Normative information on third grade children;Bless,1970
4. Experimental design;Cochran,1957
5. A cinematographic study of breathy phonation: An evaluation of its efficiency as a therapeutic device;Fisher;Paper presented at the American Speech and Hearing Association Annual Convention, Chicago,1972