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- Berlo , David K. and Lemert , James . 1961 . “An Empirical Test of a General Construct of Credibility,” . Paper presented to SAA Convention . December 1961 , New York.
- Lindquist , E. F. 1956 . Design and Analysis of Experiments in Psychology and Education 93 Boston
- Edwards , Allen L. 1960 . Experimental Design in Psychological Research 152 – 154 . New York
- Snedecor , George W. 1956 . Statistical Methods Ames, Iowa
Speech Monographs
Volume 34, 1967 - Issue 2