APA (7th ed.) Citation

NE, B., & CJ, B. (2021). What is the most appropriate respiratory protection against COVID-19? BMJ evidence-based medicine, 26(6), e5. https://doi.org/10.1136/bmjebm-2020-111441

Chicago Style (17th ed.) Citation

NE, Burr, and Black CJ. "What Is the Most Appropriate Respiratory Protection Against COVID-19?" BMJ Evidence-based Medicine 26, no. 6 (2021): e5. https://doi.org/10.1136/bmjebm-2020-111441.

MLA (9th ed.) Citation

NE, Burr, and Black CJ. "What Is the Most Appropriate Respiratory Protection Against COVID-19?" BMJ Evidence-based Medicine, vol. 26, no. 6, 2021, p. e5, https://doi.org/10.1136/bmjebm-2020-111441.