(1977) The effect of stress on the fundamental frequency of the voice. J. Acoustical Soc. Amer.62: Supplement 1, 25-6(abstract). [Cited in Scherer, Klaus R. (1979) Personality markers in speech. In Klaus R. Scherer and Howard Giles (eds.) Social markers in speech. Cambridge: University Press doi: 10.1121/1.2016095