Moelyo, A., A. Susanto, B. Rajagukguk, and J. Tjiayadi. “Knee Height and Knee Height/Height Ratio of Healthy Schoolchildren”. Paediatrica Indonesiana, Vol. 60, no. 5, July 2020, pp. 233-8, doi:10.14238/pi60.5.2020.233-8.