For your two essay assignments, you are required to use at least three sources from scholarly archaeological journals. Try searching for these articles here:
For this course, you'll be using the Society for American Archaeology (SAA) style guide to cite your sources. Jump to pages 21-25 for help with in-text citations, and to page 31 for your References Cited page at the end of your paper.
Purdue's OWL is also a great resource for help with using citations in research.