James Ciment 
World Terrorism: An Encyclopedia of Political Violence from Ancient Times to the Post-9/11 Era [PDF ebook] 
An Encyclopedia of Political Violence from Ancient Times to the Post-9/11 Era

First Published in 2015. This collection holds three volumes. Terrorism is a term that defies easy definition and its meaning has also changed over the course of history. Because this encyclopedia aims at comprehensiveness -across time, geography, and the conceptual landscape -it applies the broadest definition of terrorism: the use of violence or the threat of violence to effect political change through fear, in which the victims of the violence. The encyclopedia is divided into six parts.