If you aren't sure what kind of resources you need, encyclopedias, handbooks, and readers on Latin American history or cultural studies can be a good place to start.
Reference works make excellent starting points for research; they provide concise articles on key topics by scholars of the field, often accompanied by suggestions for further reading. Many of the sources listed below are print volumes shelved in Van Pelt Library Reference Stacks, on the first floor of Van Pelt.