Nurhayati, N., S. Soetjiningsih, and I. K. Suandi. “Relationship Between Protein Energy Malnutrition and Social Maturity in Children Aged 1-2 Years”. Paediatrica Indonesiana, Vol. 42, no. 11-12, Dec. 2006, pp. 261-7, doi:10.14238/pi42.6.2002.261-7.