Kusworo, Y. A., A. Kristiyanto, and M. Doewes. “Acute Effect Of Active And Passive Static Stretching On Range Of Motion On Hip Joint Flexibility On Female Karate Athletes Of Muhammadiyah University Of Surakarta”. Journal of Health (JoH), Vol. 5, no. 2, July 2018, pp. 50-55, doi:10.30590/vol5-no2-p50-55.