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Your assignment includes citing three "published, peer-reviewed sources." The video below calls these scholarly resources (the terms are somewhat interchangeable) and explains how these are different from other sources.
Limit to Peer-Reviewed Articles
Look beyond the first 10. There may be good stuff a way down the list.
Research is process. You search for information, read it, assess it for whether it covers your topic and meets your needs, then you take what you learned from the first time and search for information again.
When you see something good, READ IT—look at the subject terms and abstract and turn those around in a revised search.
What if I can’t link to full text?
See a librarian! It may be in a different database, available in our paper subscriptions, or available from another library. We can help you navigate those choices.