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Introductory works and encyclopedias can provide overviews of the topic and are helpful sources of definitions, names, dates and citations to significant works. Some specialized publications are listed below. You might also try Credo Reference or Gale Virtual Reference Library which cover many different subject areas.
A Fatal Addiction: war in the name of God. by 
Fighting Words: religion, violence, and the interpretation of sacred texts. by A sample of books available about the religious justification of violence. For more information or to locate additional resources, please search the library catalog or contact a librarian if you need assistance.
Belief and Bloodshed: religion and violence across time and tradition by 
Cruel Creeds, Virtuous Violence: religious violence across culture and history by 
The fundamentalist mindset : psychological perspectives on religion, violence, and history
The Oxford Handbook of Religion and Violence by