Parashar, Anupam, Anmol Gupta, Narender Mahajan, Vijay Barwal, Devender Verma, Amit Sachdeva, and Shishupal Thakur. “Immunization Coverage in the District Sirmaur, Himachal Pradesh, India: Evaluation Using the 30 X 7 Cluster Sampling Technique”. International Journal Of Community Medicine And Public Health 3, no. 11 (December 22, 2016): 3117–3122. Accessed October 23, 2025. https://www.ijcmph.com/index.php/ijcmph/article/view/110.