DePauw, Karen P; Gavron, Susan J (1995). Disability and sport. Champaign, IL: Human Kinetics. p. 85. ISBN0873228480. OCLC31710003
DePauw, Karen P; Gavron, Susan J (1995). Disability and sport. Champaign, IL: Human Kinetics. p. 128. ISBN0873228480. OCLC31710003
Cerebral Palsy-International Sports and Recreation Association (1983). Classification and sport rules manual (Third ed.). Wolfheze, the Netherlands: CP-ISRA. p. 1. OCLC220878468
Cerebral Palsy-International Sports and Recreation Association (1983). Classification and sport rules manual (Third ed.). Wolfheze, the Netherlands: CP-ISRA. pp. 7–8. OCLC220878468
Cerebral Palsy-International Sports and Recreation Association (1983). Classification and sport rules manual (Third ed.). Wolfheze, the Netherlands: CP-ISRA. pp. 4–6. OCLC220878468