References
- Mathews , Donald K. 1953 . Comparison of Testers and Subjects in Administering Physical Fitness Index Tests . Research Quarterly , 24 : 442 – 445 .
- Clarke , Harrison H. 1950 . Application of Measurement to Health and Physical Education , New York : Prentice-Hall, Inc. .
- Edwards , Allen L. 1950 . Experimental Design in Psychological Research , New York : Rinehart and Co., Inc. .