1. Judging Personality from Voice
2. Cantril, H. and Allport, G. W. 1935.The Psychology of Radio, 276New York: Harper.
3. Davenport, C. B. and Ekas, M. P. 1936.Statistical Methods in Biology, Medicine and Psychology, 216New York: Wiley.
4. Garrett, H. E. 1926.Statistics in Psychology and Education, 317New York: Longmans, Green.