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You should be able to find most of the information that you need through the databases found in ZipSearch. Some may find it easier to search individual databases, however, rather than search them all simultaneously. Here are lists of databases by subject that are relevant to this project.
Comprehensive research tool for all areas of sports, sports management, and sports medicine literature.
JSTOR is somewhat covered in ZipSearch. Much of the early content does not have abstracts, which is what ZipSearch searches, so this content does not appear in ZipSearch. However, this assignment likely calls for more recent sources, so you probably don't have to go directly to JSTOR. But if you do:
The alternative to searching in abstracts is searching in full text. Since that is going to produce a lot of irrelevant results, it helps to limit your search to subject areas (below on the advanced search screen)