1. Gaelic Athletic Association (2010) Official Guide—Part 1. Central Council for the Association, Dublin
2. Gaelic Athletic Association (2004) Annual report. Central Council for the Association, Dublin
3. AS TM F1887–02 (2002) Test method for measuring the coefficient of restitution (COR) of baseballs and softballs. American Society for Testing and Materials, West Conshohocken
4. BS 5993 (1994) Specification for cricket balls. British Standards Institution, London
5. AS TM F2845–10 (2010) Standard test method for measuring the dynamic stiffness (DS) and cylindrical coefficient of restitution (CCOR) of baseballs and softballs. American Society for Testing and Materials, West Conshohocken