Gupta, N. et al. 2025. Comparative Study of Nasopharyngeal Swab, Oropharyngeal Swab and Oral Saliva for the Diagnosis of COVID-19. International Journal of Recent Advances in Multidisciplinary Topics. 6, 11 (Nov. 2025), 20–22. DOI:https://doi.org/10.65138/ijramt.2025.v6i11.3153.