1. Standards for exercise testing in the pediatric age group: American Heart Association Council on Cardiovascular Disease in the Young: ad hoc committee on exercise testing;James FW;Circulation.,1982
2. Bar-Or 0 Ward D. Rating of perceived exertion in children. In: Bar-Or 0 ed. Advances in Pediatric Sport Sciences: Biological Issues. Champaign Ill: Human Kinetics Publishers; 1989:151-168.
3. Tomassoni TL. Conducting the pediatric exercise test. In: Rowland TW ed. Pediatric Laboratory Exercise Testing: Clinical Guidelines. Champaign Ill: Human Kinetics Publishers; 1993:1-17.
4. The working capacity of Toronto schoolchildren;Shephard RJ;Can MedAssoc J.,1969