Sadoh, Ayebo E, and Charles O Eregie. “Timeliness and Completion Rate of Immunization Among Nigerian Children Attending a Clinic-Based Immunization Service”. Journal of Health, Population and Nutrition 27, no. 3 (September 15, 2009): 391–395. Accessed October 9, 2025. https://www.banglajol.info/index.php/JHPN/article/view/3381.