Shimray, Chong, and Shrishail E Shirol. “An Introduction to Immune System With Special Focus on Vaccines for SARS-CoV-2: Part I”. SCHOOL SCIENCE 59, no. 1-2 (June 30, 2021): p.94–102. Accessed August 19, 2025. http://ejournals.ncert.gov.in/index.php/SS/article/view/2759.