Khan, A., S. Saleem, A. Rasool, M. Khan, M. Akhtar, I. Munir, and S. Afzal. “Seroprevalence of Vaccine Preventable Diseases Among Children: A Systematic Review”. Journal of Society of Prevention, Advocacy and Research KEMU, vol. 2, no. 3, July 2023, pp. 183-90, https://journalofspark.com/journal/index.php/JSpark/article/view/224.