Nurhayati, Nurhayati, Soetjiningsih Soetjiningsih, and I Ketut G. Suandi. 2006. “Relationship Between Protein Energy Malnutrition and Social Maturity in Children Aged 1-2 Years”. Paediatrica Indonesiana 42 (11-12):261-7. https://doi.org/10.14238/pi42.6.2002.261-7.