References
- Clarke , Harrison H. 1953 . A Manual: Cable-Tension Strength Tests , Chicopee , Mass. : Brown-Murphy Co. .
- Clarke , Harrison H. , Shay , Clayton T. and Mathews , Donald K. 1955 . Strength decrements from carrying various packs on military marches . Research Quarterly , 26 : 253 – 265 .
- Garrett , Henry E. 1953 . Statistics in Education and Psychology, , 4th ed. , New York : Longmans, Green and Co. .