Chandra Datta, Subhas. “NGO Act As Potential-Policy-Developer Social-Vaccine-COVID-19 Epidemic-Model until Discovery-of-Medical-Vaccine: Achieved Green-Socio-Economic Welfare Science Technology Innovations”. Archives of Community Medicine and Public Health 6, no. 2 (October 15, 2020): 225–232. Accessed September 28, 2025. https://www.healthdisgroup.com/acmph/article/view/ACMPH-6-211.