GALE Student Resources (search "Japan")
History Reference Center collects full-text articles from Magazines, Academic Journals, Reference Books and more. (you may want to limit your search to Reference Sources... how would you do that?)
Also see this list of History of Japan topics
Don't forget to "expand your Research Topic" if you have one, and try other
eLibrary is a good choice for general background on a topic, as well as current news and periodicals, and Primary documents.
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