Sources
Campbell, Neil A., and Jane B. Reece. Biology. San Francisco: Benjamin Cummings, 2002. Print.
"CDC Smallpox | Smallpox Overview." CDC Emergency Preparedness & Response Site. Web. 28 Nov. 2011. <http://www.bt.cdc.gov/agent/smallpox/overview/disease-facts.asp>.
"Epidemics of the Past: Smallpox: 12,000 Years of Terror — Infoplease.com." Infoplease: Encyclopedia, Almanac, Atlas, Biographies, Dictionary, Thesaurus. Free Online Reference, Research & Homework Help. — Infoplease.com. Web. 28 Nov. 2011. <http://www.infoplease.com/cig/dangerous-diseases-epidemics/smallpox-12000-years-terror.html>.
"Smallpox Virus Illustrations, Pictures of Smallpox Virus, Structure, Appearance and Replication (life Cycle) by Russell Kightley Media." Russell Kightley Media: Scientific Illustrator (science Illustration, Graphics and Animation) Home Page. Russell Kightley Media. Web. 28 Nov. 2011. <http://www.rkm.com.au/VIRUS/SMALLPOX/>.
"Variola Virus." Internet FAQ Archives - Online Education - Faqs.org. Web. 28 Nov. 2011. <http://www.faqs.org/espionage/Ul-Vo/Variola-Virus.html>.