Generally, reference works contain collected brief information centered around a theme, as compiled by credentialed experts in the field. They are generally designed to start a research project off on solid footing, with basic backgrounds, overviews, or statistics to help guide your next steps.
The sources listed here were selected for help investigating world cultural regions, especially if given a cultural item (film, music, food, cultural practice, etc.) To find more sources like these try Reference Universe (below), try the Library Catalog, or ask a librarian!