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What are some good sources for this history term paper?

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So i am witting a 3 page paper on international trade, but how it would have changed history up to the 1500 hundreds if it never happened or occurred, and all things it would effect. I also, am having to display it on a poster board creatively. NO im not asking for people to do it for me. I just needs some help find good, trustworthy sources, not Wikipedia, professor wont let me. this is due next Monday! PLEASE HELP ANY WAY POSSIBLE!