Azis A., Abdul, Aliamran Rasjid, Sudijanto Sudijanto, and Rachmat Kurdi. 2017. “Optional Immunizations As Parameter of Parent’s Behavioral Change in Health Needs of Their Off-Springs”. Paediatrica Indonesiana 19 (11-12), 265-75. https://doi.org/10.14238/pi19.11-12.1979.265-75.