1. ASTM F1887, Standard test for measuring the coefficient of resititution (COR) of baseballs and softballs (2002).
2. ASTM F2398-11, Standard test method for measuring moment of inertia and center of percussion of a baseball or softball bat, reapproved (2015).
3. Cross, R., The sweet spot of a baseball bat, American Journal of Physics, Vol.66, No.9 (1998), pp.772–779.
4. Cross, R., Center of percussion of hand-held implements, American Journal of Physics, Vol.72, No.5 (2004), pp.622–630.
5. Drane, P., Sherwood, J., Colosimo, R. and Lretshmann, D., A study of wood baseball bat breakage, Procedia Engineering, Vol.34 (2012), pp.616–621.