Finding academic journal articles is easier today than ever before. There are three basic types of databases: (1) general, (2) subject or discipline-specific, and (3) area specific databases.
General databases index articles and book chapters (and sometimes books, conference proceedings, and dissertations) covering a wide-range of topics and disciplines. A good example of a general database is Articles Plus, a full-text article database covering a broad range of academic disciplines and numerous areas of study.
Subject databases are more specialized. For instance, Historical Abstracts indexes scholarly publications specific to the study of history.
The Genocide Studies Program at Yale University has developed four separate databases featuring bibliographic information, images, primary source documents, biographies, and audio recordings documenting the atrocities committed during the Khmer Rouge regime.