Two books with numerous studies of nonviolent social change around the world:
Civil Resistance and Power Politics: The Experience of Non-violent Action from Gandhi to the Present, edited by Adam Roberts and Timothy Garton Ash. New York, NY: Oxford, 2009.
Waging Nonviolent Struggle: 20th Century Practice and 21st Century Potential, Gene Sharp. Boston, MA: Extending Horizons, 2005.
Previously, I wrote about Sharp here.