Michael J. Hamlin and  Mick Grimley and  Vicki Cowley and  Chris D. Price and  Jill M. Hargreaves and  Jenny J. Ross,  Heart Rate-Determined Physical Activity In New Zealand School Children: A Cross- Sectional Study.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2011, vol. 53(5). 694 - 699
    [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/11350.