Wahyudi, Arief Nur. “Pengaruh Latihan High Intensity Interval Training (Hiit) Dan Circuit Training Terhadap Kecepatan, Kelincahan, Dan Power Otot Tungkai”. JSES : Journal of Sport and Exercise Science, vol. 1, no. 2, Sept. 2018, pp. 47-56, doi:10.26740/jses.v1n2.p47-56.