The International Encyclopedia of Revolution and Protest
A comprehensive resource covering major rebellions and protest movements over the past 500 years, and the idealogies and activists that propelled them. Use the Advanced Search to find keywords in the Title or Abstract of articles, e.g. Sandinista or Batista. Each article has a bibliography of scholarly sources.
The International Encyclopedia of the Social and Behavioral Sciences
Here you can find articles on the sociological aspects of revolutions, with substantial bibliographies. Relevant entries include The Cuban Revolution • The Mexican Revolution • Theories of Revolution • Sociology of Revolutions
Atlas sociolingüístico de pueblos indígenas en América Latina
Each country's page presents demographic fact sheets on each of its indigenous groups.
Oxford Bibliographies Online: (every source has a "Find It" link to search for online text)