Yulian, Ely, Endy Paryanto, and Sunartini Hapsara. 2008. “The Duration of Playing Play Station@ As a Risk Factor of Obesity in School Age Children in Yogyakarta”. Paediatrica Indonesiana 48 (1), 15-7. https://doi.org/10.14238/pi48.1.2008.15-7.