Kuhn, Richard J. "Togaviridae: The Viruses and Their Replication." Field's Virology. 5th Edition.
Schmaljohn, Alan and David McClain. "Alphaviruses (Togaviridae)." Link
"Togaviridae." ICTVdB Index of Viruses. Link
"Togaviridae." The Big Picture Book of Viruses. Link
"Togaviridae." MicrobeWiki. Link
"Togaviruses." Microbiologybytes.com Link
And of course:
"Arboviral Encephalitides." CDC. Link
"Rubella." CDC Link