1. Bell, W., Cobner, D., Cooper, S.M. and Phillips, S.J. (1993). Anaerobic performance and body composition of international Rugby Union players. In Science and Football II (edited by T. Reilly, J. Clarys and A. Stibbe), pp. 15-20. London: E & FN Spon.
2. Carter, J.E.L. and Heath, B.H. (1990). Somatotyping -development and applications. In Cambridge Studies in Biological Anthropology (edited by G.W. Lasker, C.G.N. Mascie-Taylor and D.F. Roberts), pp. 367-378. Cambridge: Cambridge University Press.
3. Cheetham, M.E., Hazeldine, R.J., Robinson, A. and Williams, C. (1988). Power output of rugby forwards during maximal treadmill sprinting. In Science and Football (edited by T. Reilly, A. Lees, K. Davids and W.J. Murphy), pp. 206-210. London: E & FN Spon.
4. Cohen, J. (1969). Statistical Power Analysis for the Behavioral Sciences. New York: Academic Press.
5. Guy, R.A., Gentry, S.E., Stewart, J.J. and Smith, L.D. (eds) (1991). Coaching Accreditation Manual-Level 2. Wellington: New Zealand Rugby Football Union, Inc.