Kerrod, E., Geddes, A. M., Regan, M., & Leach, S. (2005). Surveillance and Control Measures during Smallpox Outbreaks. Centers for Disease Control and Prevention.
Chicago-tyylinen lähdeviittausKerrod, Emma, Alasdair M. Geddes, Martyn Regan, ja Steve Leach. Surveillance and Control Measures During Smallpox Outbreaks. Centers for Disease Control and Prevention, 2005.
MLA-viiteKerrod, Emma, Alasdair M. Geddes, Martyn Regan, ja Steve Leach. Surveillance and Control Measures During Smallpox Outbreaks. Centers for Disease Control and Prevention, 2005.
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