Puspitasari, D. E., and F. Syahrul. “The Risk Factors of Pneumonia Disesase at Babies Under Five Years Old Based on Measles Imune Status and Breast Freeding Exclusive Status”. Jurnal Berkala Epidemiologi, vol. 3, no. 1, Jan. 2015, pp. 69-81, doi:10.20473/jbe.V3I12015.69-81.