For most assignments, you will need to find and cite articles from reputable professional journals. The databases below index many of them, and some are linked in the "Some Important Journals" box, on the sidebar.
If you aren't finding what you hoped for, try changing search terms, (sometimes it's just the difference of a space, such as between mouth feel OR mouthfeel. Check the thesaurus for better search terms, or try a different database. Coverage varies in depth, quantity and quality.