Anu Shrivastava, Aparna Agarwal, and Swati Jain. “Quality and Content of Online Information Related to ‘Immunity Boosting’ During COVID-19 Pandemic: Comparison of Google and DuckDuckGo”. Asian Pacific Journal of Health Sciences 9, no. 1 (January 15, 2022): 142–147. Accessed July 30, 2025. https://apjhs.com/index.php/apjhs/article/view/1818.