1. Beunen, G. (1989). Biological age in pediatric exercise research. In Advances in Pediatric Sports Sciences (edited by O. Bar-Or), pp. 1-39. Champaign, EL: Human Kinetics.
2. Fitt, A.B. (1941). Seasonal Influence on Growth, Function and Inheritance. Oxford: Oxford University Press.
3. Sharp, C. (1995). School Entry and the Impact of Season of Birth on Attainment. Slough: National Foundation for Educational Research.
4. Sharp, C. and Benefield, P. (1995). Research into Season of Birth and School Achievement: A Select Annotated Bibliography. Slough: National Foundation for Educational Research.