The document discusses various sources of information for research, including magazines, journals, periodical indexes, newspapers, library catalogs, books, and the World Wide Web. Magazines contain articles written by journalists or scholars on various topics. Journals contain scholarly peer-reviewed articles, especially in medical fields. Periodical indexes point to citations and sometimes abstracts of articles across magazines and journals. Newspapers report on current events. Library catalogs provide access to materials available in a specific library. Books synthesize information on a topic. The World Wide Web allows access to many types of online information through links.