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Journal articles can help you delve deeper into your topic than books and encyclopedias. Review articles will give you an overview of the state of a field over a period of time (pay attention to the publication date; they go out-of-date quickly). Research articles tell you exactly how a scientist performed his or her experiments and interpreted the results.
These resources help you find journal articles in various fields related to your projects.
Indexes most peer reviewed journals in science, technology, and medicine, and many in the social sciences, arts, and humanities. Scopus also includes a number of trade publications and conference papers, and can perform author and affiliation searching.
General, multidisciplinary periodical database, covering all scholarly disciplines, with many general and popular magazines, and news sources. Includes bibliographic citations with indexing and abstracts for more than 16,000 periodicals.
Access to Google Scholar with Penn-only links to full-text articles. Once authenticated through Penn's proxy, full-text articles to which Penn Libraries subscribe will become available within the Google Scholar search results.