References
- Lewis , D. and Tiffin , J. 1934 . “A Psychophysical Study of Individual Differences in Speaking Ability” . Archives of Speech , I : 1
- Murray , Elwood and Tiffin , Joseph . 1934 . “An Analysis of Some Basic Aspects of Effective Speech” . Archives of Speech , I : 1
- Fairbanks , Grant . 1940 . “Recent Experimental Investigations of Vocal Pitch in Speech” . J. Acous. Soc. Am. , XI : 4
- Lynch , G. A. 1934 . “Phonophotographic Study of Trained and Untrained Voices Reading Factual and Dramatic Material” . Archives of Speech , I : 1