Mahajan, Harsh, Shalini Srivastava, and S. Nagesh. “Immunization Coverage in an Urban Resettlement Colony of District Gautam-Budh Nagar, Uttar Pradesh, India Using WHO 30×7 Cluster Sampling Technique”. International Journal Of Community Medicine And Public Health 4, no. 11 (October 25, 2017): 4089–4095. Accessed October 23, 2025. https://www.ijcmph.com/index.php/ijcmph/article/view/2131.