TY  - BOOK
AU  - Byl, John.
TI  - Having a ball: stability ball games. 
SN  - 9780736072540
AV  - GV 484 .B95 2008
PY  - 2008///
CY  - Champaign, IL
PB  - Human Kinetics
KW  - Exercise
KW  - Swiss erercise balls
ER  -