WASET
    Sri Sumartiningsih and  Anies Setiowati,  The Effect of Breaststroke Swimming Exercise to Increase the Value of Peak Expiratory Flow.   journal   = {International Journal of Sport and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    May 2011, vol. 53(5). 505 - 507
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/9682.