Here you will find links to various acceptable sources to use during your research. Encyclopedia Britannica is the only non-authored source you are allowed to use. Ideally, you will use ProQuest and Ebsco Academic Search Premier to find your authored sources. National Geogrpahic and Smithsonian Magazine are acceptable authored sources for this research project. You may find the articles from those sources easier to read and understand compared to the articles you may find using ProQuest and Ebsco.
Before using any source not covered here, seek out teacher approval first.