Epperson, S., Davis, C. T., Brammer, L., Abd Elal1, A. I., Ajayi, N., Barnes, J., . . . Jernigan, D. (2019). Update: Influenza Activity — United States and Worldwide, May 19–September 28, 2019, and Composition of the 2020 Southern Hemisphere Influenza Vaccine. MMWR Morb Mortal Wkly Rep.
Citação norma ChicagoEpperson, Scott, et al. "Update: Influenza Activity — United States and Worldwide, May 19–September 28, 2019, and Composition of the 2020 Southern Hemisphere Influenza Vaccine." MMWR Morb Mortal Wkly Rep 2019.
MLA引文Epperson, Scott, et al. "Update: Influenza Activity — United States and Worldwide, May 19–September 28, 2019, and Composition of the 2020 Southern Hemisphere Influenza Vaccine." MMWR Morb Mortal Wkly Rep 2019.
警告：這些引文格式不一定是100％准確.