Scholarly/academic journals, e.g. Journal of Knowledge Management, Economics and Infromation Technology, may be peer-reviewed and provide research findings in a discipline.
Trade publications, like CIO and Computerworld, inform or educate professionals in an industry or management function (e.g. IT).
Popular magazines, like Time, Bloomberg Businessweek, Harvard Business Review, and newspapers like The Wall Street Journal, inform or entertain the general public.
If in doubt, ask your professor what kinds of periodicals s/he prefers you to use for the assignment.
These databases may provide a different focus for your search. You might use them in addition to one of the comprehensive databases listed above, or if you have a multidisciplinary topic.
Search the Journals and Magazines A-Z list to discover if the periodical you seek is one of more than 80,000 titles available full-text online or in print from the library.