Institute of Medicine (US) Forum on Microbial Threats (2005). "1: The Story of Influenza". In Knobler, S.; Mack, A.; Mahmoud, A.; Lemon, S. (eds.). The Threat of Pandemic Influenza: Are We Ready? Workshop Summary. Washington, D.C.: The National Academies Press. pp. 60–61. doi:10.17226/11150. ISBN978-0-309-09504-4. PMID20669448.
Institute of Medicine (US) Forum on Microbial Threats (2005). "1: The Story of Influenza". In Knobler, S.; Mack, A.; Mahmoud, A.; Lemon, S. (eds.). The Threat of Pandemic Influenza: Are We Ready? Workshop Summary. Washington, D.C.: The National Academies Press. pp. 60–61. doi:10.17226/11150. ISBN978-0-309-09504-4. PMID20669448.
Institute of Medicine (US) Forum on Microbial Threats (2005). "1: The Story of Influenza". In Knobler, S.; Mack, A.; Mahmoud, A.; Lemon, S. (eds.). The Threat of Pandemic Influenza: Are We Ready? Workshop Summary. Washington, D.C.: The National Academies Press. pp. 60–61. doi:10.17226/11150. ISBN978-0-309-09504-4. PMID20669448.