- Bluemel , C. S. 1933 . Stammering and Allied Disorders 156 New York
- Van Riper , C. 1939 . Speech Correction 337 – 338 . New York
- Travis , L. E. 1931 . Speech Pathology 138 New York
- West , R. , Kennedy , L. and Carr , A. 1937 . The Rehabilitation of Speech 261 New York
- Bills , A. G. 1937 . “Fatigue in Mental Work” . Physiol. Rev , XVII : 438
- Campbell , J. M. H. 1927 . “The Pulse Rate After Exercise in Health and Disease” . Guy's Hosp. Reports , LXXVII : 184 – 215 .
- Frey , H. 1930 . “A Study of the Efficiency of College Women as Indicated by the Pulse‐Ratio Test” . State University of Iowa . M. A. Thesis
- Hambley , W. D. , Hunt , G. H. , Parker , L. E. L. , Pembrey , M. S. and Warner , E. G. 1922 . “Tests for Physical Efficiency” . Guy's Hosp. Reports , LXXII : 367 – 385 . Part> II
- Hunter , J. G. 1939 . “The Nature of the Response of the Heart to Stool‐Stepping and Bicycle Riding” . State University of Iowa . M. A. Thesis
- Colley , W. H. 1939 . “The Relation of Frequency to Duration of Moments of Stuttering” . State University of Iowa . M. A. Thesis
- Johnson , W. and Brown , S. F. 1935 . “Stuttering with Relation to Various Speech Sounds” . Quarterly Journal of Speech , XXI : 481 – 496 .
- Mann , M. B. 1937 . “Stuttering in Relation to Speech Sounds of Young Children” . State University of Iowa . M. A. Thesis
- Peters , C. C. and Van Voorhies , W. R. 1940 . Statistical Procedures and Their Mathematical Bases 327 – 330 . New York
- Fisher , R. A. 1936 . Statistical Methods for Research Workers , Sixth Edition London
- Lindquist , E. F. 1941 . Statistical Analysis in Educational Research New York
- Snedecor , G. W. 1940 . Statistical Methods Ames, Iowa
- This study is the substantial equivalent of a Master's Thesis completed in 1940 at the State University of Iowa under the supervision of Dr. Wendell Johnson. The writer is indebted to him for suggestion of the problem and for guidance and help throughout the research.
Speech Monographs
Volume 9, 1942 - Issue 1