MLA International Bibliography is the primary database for finding scholarly articles in literature and film. You can search for an author, a work, a keyword, etc. The citations link to full-text in many but not ALL cases because the database contains citations for articles (often readily available electronically) but also books (not so available electronically) and dissertations (not always electronically available).
Historical Abstracts is a database of articles from international history journals and magazines.
JSTOR has 67 important journals relating to Latin American studies. JSTOR does not have current (last 5 years) in the case of many of these journals, but they have the complete historical full-text.
ProQuest Dissertations and Theses is a database of Masters theses and PhD dissertations from all over the world. These book-length papers are often available full-text and usually have good bibliographies.