1. Abdullah, M. R., Musa, R. M., Kosni, N. A., Maliki, A. B. H. M., & Haque, M. (2016). Profiling and distinction of specific skills related performance and fitness level between senior and junior Malaysian youth soccer players. International Journal of Pharmaceutical Research, 8(3), 64–71.
2. Ashira Hiruntrakul MSc, Ratanavadee Nanagara MD, Alongkot Emasithi PhD, K. T. B. P. (2010). Effect of Once a Week Endurance Exercise on Fitness Status in Sedentary Subjects. Journal of the Medical Association of Thailand, 93(9), 1070–1074.
3. Burich, R., Teljigović, S., Boyle, E., & Sjøgaard, G. (2015). Aerobic training alone or combined with strength training affects fitness in elderly: Randomized trial. European Journal of Sport Science, 15(8), 773–783.
4. Cohen, D. D., Voss, C., Taylor, M. J. D., Stasinopoulos, D. M., Delextrat, A., & Sandercock, G. R. H. (2010). Handgrip strength in English schoolchildren. Acta Paediatrica, International Journal of Paediatrics, 99(7), 1065–1072.
5. Cook, R. C., Cook, J. G., Irwin, L. L., Cook, R. C., Cook, J. G., & Irwin, L. L. (2019). Linked references are available on JSTOR for this article : 2 Ungulate Research and Management Estimating elk body mass using chest-girth circumference. 31(2), 536–543.