1. Afshar, A. (2010). A brief Iranian medical history through commemorative postage stamps. Archives Iranian Medicine, 13(2), 161–165.
2. American Topical Association. (2021). ATA checklist 1657: Covid-19. atachecklists@ata.gmail.com. Last updated 29 May 2021.
3. Arnold, E., Skvara, F., & Blum, R. (1990). Scalpel and tongs: American journal of medical Philately. American Topical Association. Handbook.
4. Bigalke, J. (2020, December 28). Top stamp stories of 2020: COVID-19 impacts many parts of the hobby. Linn’s Stamp News, p. 4.
5. Bogdan-Vasile, C., Pop, A. L., & Coman, M. (2020). COVID-19 stamps – A new collecting theme vs. philatelic promotion of care for affected community and environment. Asian Journal of Education and Social Studies, 9(2), 25–37.