Barry, John M. (2005). The Great Influenza. United States: Penguin Books. hlm. 270. ISBN0670894737. On September 15, New York City's first influenza death occurred.
Brundage JF, Shanks GD (December 2007). "What really happened during the 1918 influenza pandemic? The importance of bacterial secondary infections". The Journal of Infectious Diseases. 196 (11): 1717–18; author reply 1718–19. doi:10.1086/522355. PMID18008258.
Morens DM, Fauci AS (April 2007). "The 1918 influenza pandemic: insights for the 21st century". The Journal of Infectious Diseases. 195 (7): 1018–28. doi:10.1086/511989. PMID17330793.
"The Memoirs of Herbert Hoover: Years of Adventure, 1874–1920. (New York: Macmillan Company. 1951. pp. xi, 496.) and Herbert Hoover and the Russian Prisoners of World War I: A Study in Diplomacy and Relief, 1918–1919. By Edward F. Willis. (Stanford: Stanford University Press. 1951. pp. viii, 67.)". The American Historical Review: 12. 2011. doi:10.1086/ahr/57.3.709. ISSN1937-5239.
Brundage JF, Shanks GD (December 2007). "What really happened during the 1918 influenza pandemic? The importance of bacterial secondary infections". The Journal of Infectious Diseases. 196 (11): 1717–18; author reply 1718–19. doi:10.1086/522355. PMID18008258.
Morens DM, Fauci AS (April 2007). "The 1918 influenza pandemic: insights for the 21st century". The Journal of Infectious Diseases. 195 (7): 1018–28. doi:10.1086/511989. PMID17330793.
"The Memoirs of Herbert Hoover: Years of Adventure, 1874–1920. (New York: Macmillan Company. 1951. pp. xi, 496.) and Herbert Hoover and the Russian Prisoners of World War I: A Study in Diplomacy and Relief, 1918–1919. By Edward F. Willis. (Stanford: Stanford University Press. 1951. pp. viii, 67.)". The American Historical Review: 12. 2011. doi:10.1086/ahr/57.3.709. ISSN1937-5239.
Spinney, Laura (2018). Pale rider: the Spanish flu of 1918 and how it changed the world. Vintage. hlm. 37. ISBN978-1-78470-240-3. OCLC1090305029.