1. Psychophysical bases of perceived exertion
2. Cited by the Committee on Exercise, American Heart Association: Exercise Testing and Training of Apparently Healthy Individuals: A Handbook for Physicians. Dallas, AHA, 1972, p 13
3. Ward CR, Reeves J: Prostat. Wentworth, NH, Compress (Division of Wadsworth, Inc), 1986
4. Why Does Everyone Use the .05 Significance Level?