S., Gopalakrishnan, and Sujitha P. “Vaccination Programme in India- the Present Status: A Review”. International Journal Of Community Medicine And Public Health 7, no. 9 (August 28, 2020): 3746–3753. Accessed November 17, 2025. https://www.ijcmph.com/index.php/ijcmph/article/view/6835.