Tefera, Mesay, and M.K. Sharma. “Determinants of Immunization Among Children Aged 12-23 Months in Ethiopia: A Proportional Odds Model Approach”. International Journal of Statistics in Medical Research 4, no. 1 (February 13, 2015): 140–155. Accessed April 28, 2024. https://www.lifescienceglobal.com/pms/index.php/ijsmr/article/view/2746.